English learners often stop when they see phrases such as their life or their lives. Both forms look correct, and both can be used in everyday English.
The real question is not simply which one is “right.” The important question is how many people or lives you are talking about.
This small difference can change the meaning of a sentence. For example, “They changed their life” and “They changed their lives” do not always communicate exactly the same idea Their Life or Their Lives.
One may refer to a shared life or one person, while the other usually points to the separate lives of several people. Their Life or Their Lives.
The confusion becomes even greater because their can refer to one person when it is used as a singular, gender-neutral pronoun. So, understanding their life or their lives requires more than memorizing a single rule. Their Life or Their Lives.
The good news is that the basic idea is simple. You need to look at the person or people being discussed and decide whether “life” means one individual life, a shared life, or several individual lives. Their Life or Their Lives.
By the end of this guide, you will understand their life or their lives, know when each form works, recognize common mistakes, and use both naturally in writing and conversation.
What Does “Their Life” Mean?
Their life uses the singular noun life after the possessive word their. Their Life or Their Lives.
At first, this can seem strange because learners often connect their with more than one person. However, English does not always work that way. Their can refer to one person or to several people. Their Life or Their Lives.
For example:
- Alex has changed their life.
- Each student should take care of their life.
- The child is learning how to manage their life.
- Someone left their life behind to start again.
In these examples, their can refer to one person whose gender is unknown, unspecified, or intentionally not stated. Their Life or Their Lives.
When Should You Use “Their Life”?
Use their life when the meaning is connected to one life.
This often happens when their refers to one person.
Consider this sentence:
Every person has the right to choose their life.
Here, “every person” is singular. Therefore, the natural phrase is their life because we are talking about each person’s individual life. Their Life or Their Lives.
Another example is:
Someone has completely changed their life.
“Someone” refers to one person, so their life is appropriate.
There is another important situation. Their life can also describe a life shared by multiple people. Their Life or Their Lives.
For example:
The couple built their life together.
The couple contains two people, but the sentence describes one shared life that they created together. Their Life or Their Lives.
Similarly:
The family returned to their life in the countryside.
The phrase can describe their shared way of living.
Grammar Rule for “Their Life”
The simple pattern is:
their + singular noun
Examples:
- their life
- their home
- their family
- their future
- their story
The word their shows possession. The word life remains singular because the sentence focuses on one life. Their Life or Their Lives.
Here are some examples:
- She wants to improve their life.
- Everyone deserves to live their life freely.
- Someone may change their life after a major decision.
- Each person should choose their life carefully.
- The couple began their life together.
- The character lost their life in the story.
- Every child should enjoy their life.
- Nobody should control another person’s life.
Notice that the meaning depends on the context.
Common Confusion About “Their Life”
Many learners think that their must always be followed by a plural noun. That is incorrect. Their Life or Their Lives.
We say:
They brought their book.
Not:
They brought their books.
The plural form is possible, but only when they have more than one book. Their Life or Their Lives.
The same idea applies to their life or their lives. The possessive word their does not decide whether the noun must be singular or plural. Meaning decides. Their Life or Their Lives.
What Does “Their Lives” Mean?
Their lives uses the plural noun lives.
The plural of life is irregular:
life → lives
We normally use their lives when more than one person’s individual life is being discussed.
For example:
The two friends have different lives.
If we say:
The two friends changed their lives.
we usually mean that both people made changes in their own individual lives.
When Should You Use “Their Lives”?
Use their lives when two or more people have separate lives and the sentence refers to those individual lives.
For example:
The brothers went to different countries and built new lives.
Each brother built his own life, so lives is natural.
Another example:
Social media has changed their lives.
If “their” refers to several people, the plural noun lives normally tells us that their individual lives were affected.
Grammar Rule for “Their Lives”
The basic pattern is:
their + plural noun
Examples:
- their lives
- their homes
- their jobs
- their dreams
- their families
When several people each have their own life, their lives is often the clearest choice.
Examples:
- The students are planning their lives after graduation.
- The workers returned to their lives after the project ended.
- The sisters have completely different lives.
- The travelers shared stories about their lives.
- The volunteers changed many people’s lives.
- The children went back to their lives after the holiday.
- The players have busy lives outside football.
- The friends stayed connected despite living separate lives.
Common Learner Confusion
A common mistake is thinking:
They changed their life.
must always be wrong.
It is not always wrong.
If “they” refers to several people who share one life or one situation, singular life may be meaningful.
Compare:
The newly married couple changed their life.
This can describe the couple’s shared life.
But:
The three students changed their lives.
This normally means each student changed their own individual life.
That is the key difference in their life or their lives.
Difference Between “Their Life” and “Their Lives”
The most important thing to remember is that life is singular and lives is plural.
However, the choice is based on meaning, not simply on whether “their” is plural.
| Phrase | Main idea | Typical use |
|---|---|---|
| their life | One life | One person or one shared life |
| their lives | More than one individual life | Several people’s separate lives |
| their life | One person’s life | Singular they |
| their lives | Several people’s lives | Individual experiences |
| their life | Shared existence | Couples or groups |
| their lives | Separate experiences | Friends, students, workers, etc. |
Example 1: One Person
Every student should be free to choose their life.
“Every student” refers to one student at a time. Therefore, their life is natural.
Example 2: Several People
The students are making plans for their lives.
Here, several students are thinking about their individual futures.
Example 3: A Couple
They built their life together.
The focus is on one shared life.
Example 4: Several Separate Lives
They returned to their lives after the trip.
The people went back to their own separate routines and experiences.
Grammar Logic Behind “Their Life or Their Lives”
The word their is a possessive determiner. It tells us who owns or is connected to something.
It does not automatically tell us whether the noun after it should be singular or plural.
Compare:
They bought their car.
One car.
They bought their cars.
More than one car.
Likewise:
They changed their life.
One life is being discussed.
They changed their lives.
Several individual lives are being discussed.
So, when choosing their life or their lives, ask yourself:
“Am I talking about one life or several lives?”
That question solves most problems.
Grammar Rules You Must Remember
1. “Their” Can Refer to One Person
Modern English commonly uses their as a singular, gender-neutral possessive.
For example:
Every employee should check their life insurance.
Here, “their” refers to each employee individually.
Therefore, their life can be completely correct.
2. Use “Lives” for Several Individual Lives
When several people each have their own life, use lives.
For example:
The three sisters live very different lives.
Each sister has an individual life, so the plural form is appropriate.
3. A Group Can Take Singular “Life”
When the focus is on one shared existence, life can be used.
For example:
The couple created their life together.
The sentence focuses on their shared life rather than two separate lives.
4. “Life” Becomes “Lives” in the Plural
The plural form is irregular:
life → lives
Do not write:
their lifes
The correct spelling is:
their lives
For example:
They want better lives.
This spelling rule is important for students learning English.
5. Context Is More Important Than the Word “Their”
Do not choose the noun only because you see their.
Instead, look at the meaning.
The married couple enjoys their life together.
One shared life.
The married couple returned to their lives after visiting their parents.
This can emphasize their separate routines or individual experiences.
Both forms can work in different contexts.
6. Singular “Life” Does Not Always Mean Singular “Their”
This is one of the biggest lessons in their life or their lives.
Their can be singular in reference but still take a singular noun.
Example:
Someone has lost their life.
“Someone” is singular.
Common Mistakes Students Make
Mistake 1: Thinking “Their” Always Needs a Plural Noun
Some learners believe that because “their” sounds plural, they must write their lives.
That is not true.
Incorrect reasoning:
Their = plural, so life must become lives.
Better reasoning:
What does the sentence actually mean?
For example:
Everyone deserves to enjoy their life.
This is correct because “everyone” is grammatically singular.
Mistake 2: Writing “Their Lifes”
This mistake happens because many English plurals are formed by adding -s.
But life is an irregular noun.
Correct:
their lives
Incorrect:
their lifes
Remember:
knife → knives
wife → wives
life → lives
Mistake 3: Using “Their Lives” for a Shared Life
Suppose you are talking about a married couple:
They built their lives together.
This is not necessarily grammatically wrong, but it emphasizes two individual lives.
If you mean one shared existence, you may prefer:
They built their life together.
The surrounding context matters.
Mistake 4: Using “Their Life” When You Clearly Mean Several Individual Lives
For example:
The students returned to their life after college.
If each student returned to a different personal life, their lives is more natural:
The students returned to their lives after college.
The plural form makes the meaning clearer.
Mistake 5: Confusing “Their Life” With “There Life”
Remember:
- their = possession
- there = place or existence
- they’re = they are
Correct:
They are happy with their lives.
Incorrect:
They are happy with there lives.
Also incorrect:
They are happy with they’re lives.
A quick spelling check can prevent this common error.
Easy Trick to Remember the Difference
Here is a simple classroom trick.
Ask:
“One life or many lives?”
If you mean one life, choose:
their life
If you mean several individual lives, choose:
their lives
Think about these two sentences:
They built their life together.
One shared life.
They went back to their lives.
Several separate lives.
You can also remember it with a simple picture in your mind.
Imagine two people sitting together and building one house. You can think of their shared story as their life.
Now imagine those same two people going to different cities, getting different jobs, meeting different people, and following different routines. Now you are talking about their lives.
This little mental picture makes their life or their lives much easier to understand.
One more useful trick is to replace their with a clearer possessive phrase.
For example:
Each student should plan their life.
Replace “their” with “his or her”:
Each student should plan his or her life.
The singular noun becomes obvious.
Now consider:
The students should plan their lives.
You can think:
The students should plan each person’s individual life.
That points toward the plural lives.
Daily Life Examples
Examples You Can Hear in Real Conversations
Here are natural examples showing how their life or their lives works in everyday English.
1. Talking about one person’s future
Everyone wants to build their life in a way that makes them happy.
2. Talking about several friends
My friends have busy lives, but we still talk every weekend.
3. Talking about a couple
They moved to the city and started their life together.
4. Talking about students
The students are thinking about what they want to do with their lives.
5. Talking about someone
Someone should be able to live their life without unnecessary pressure.
6. Talking about family members
My brothers have different jobs and very different lives.
7. Talking about a shared home
After marriage, they began their life in a small apartment.
8. Talking about separate experiences
The two women went back to their lives after the meeting.
9. Talking about a person’s decision
She decided to take control of their life.
This example could occur when “their” refers to a person using singular they, although in a specific context “her life” might be used if the person’s preferred pronoun is known.
10. Talking about several people
The experience changed their lives forever.
This normally means that more than one person’s individual life was affected.
These examples show why context matters so much when choosing their life or their lives.
Practice Section
Choose the Correct Option
Try each sentence before looking at the answers.
1. Every person should be allowed to live ___ freely.
A. their life
B. their lives
2. The three brothers have very different ___.
A. their life
B. their lives
3. The couple wanted to build ___ together.
A. their life
B. their lives
4. The students returned to ___ after graduation.
A. their life
B. their lives
5. Someone should be able to make decisions about ___.
A. their life
B. their lives
Answers
1. Their life — “Every person” refers to one person at a time.
2. Their lives — The three brothers have separate individual lives.
3. Their life — The sentence focuses on one shared life.
4. Their lives — The students are returning to their separate personal lives.
5. Their life — “Someone” is singular, so the sentence refers to one person’s life.
The more you practice this idea, the more natural their life or their lives will feel.
FAQs
1. What is the difference between “their life” and “their lives”?
Their life normally refers to one person’s life or one shared life. Their lives normally refers to the separate individual lives of two or more people. The correct choice depends on the meaning and context.
2. Is “their life” grammatically correct?
Yes. Their life is grammatically correct. It can refer to one person when singular they is used, or to a shared life belonging to more than one person.
3. Is “their lives” always used for multiple people?
Usually, their lives is used when several people have individual lives being discussed. However, the important point is not simply the number of people. The sentence should be examined for its intended meaning.
4. Can “they” take “their life”?
Yes. A sentence such as “They changed their life” can be correct when “they” refers to one person using singular they. It can also work in contexts where a group is viewed as having one shared life.
5. Is “their life or their lives” correct in questions?
Yes. Both forms can appear in questions depending on the meaning. For example, “Are they happy with their life?” can refer to one person or a shared life, while “Are they happy with their lives?” often refers to several individual lives.
6. Which is more common: “their life” or “their lives”?
Neither form is always better. Their life is natural when one life is meant, while their lives is natural when several individual lives are meant. Always choose based on meaning rather than simply counting the word “their.”
Conclusion
Choosing between their life or their lives becomes much easier when you stop focusing only on the word their.
Remember the basic idea: life is singular, while lives is plural. Use their life when you mean one person’s life or one shared life. Use their lives when you mean several separate individual lives.
The word their can refer to one person, especially with singular they, so it does not automatically require the plural noun lives. This is one reason learners often find the phrase confusing.
Context is your best guide. Ask yourself a simple question: “Am I talking about one life or several individual lives?” If the answer is one, choose their life. If the answer is several, choose their lives.
Also remember the spelling: life → lives, not “lifes.”
With a little practice, you will stop guessing and start choosing naturally. The next time you see their life or their lives, look at the meaning first. That small habit will make your English clearer and more confident.
Hi, I’m Isabella Foster, an English language writer passionate about making grammar, vocabulary, and communication skills easy to understand. At EnglishVistor, I create clear, practical, and engaging learning resources to help learners improve their English with confidence.
