Their Life vs Their Lives: Which Is Correct? Easy Grammar Guide

If you are unsure whether to use their life or their lives, the answer depends mainly on how many people you are talking about. Both expressions can be grammatically correct, but they are used in different situations. Understanding whether their refers to one person or several people will help you choose the right form.
The confusion often comes from the possessive determiner their, which can refer to a singular person or multiple people. The important point is that life and lives follow the number of people being discussed and the intended meaning. Once you understand this simple relationship, choosing between their life and their lives becomes much easier.

Quick Answer

Both their life and their lives can be correct.
Use their life when their refers to one person or when you are discussing a shared life as a single unit.
Use their lives when their refers to two or more people and you mean their individual lives.

Simple rule

• One person → their life
• Two or more people → their lives
  Examples:
• Every student should take responsibility for their life.
• The two brothers have completely different lives.
  However, context matters, especially when their is being used as a singular gender-neutral pronoun.

Their Life Meaning

Their life means the life of one person when their is used as a singular gender-neutral possessive determiner.
For example:
Every person has the right to make their own decisions about their life.
Here, their refers to one person, even though the person’s gender is not specified.
This use is extremely common in modern English and is known as singular they.
You can also use their life when talking about a specific individual whose gender is known but you choose not to identify it:
Someone left their phone in the classroom and went back to get it.
In this sentence, their refers to one unknown person.
The plural noun lives would not be appropriate because only one person’s life is being discussed.

Their Lives Meaning

Their lives refers to the individual lives of two or more people.
For example:
The three friends went on to build successful lives.
Here, their refers to three people, so lives is plural.
Other examples include:

• The children returned to their normal lives.
• Their lives changed after the move.
• The two families live very different lives.
• The players have busy lives outside the sport.
  Each person has an individual life, so lives is appropriate.

Why Life Becomes Lives

The noun life has an irregular plural form.
The plural of life is lives, not lifes.
This is an important spelling rule:
life → lives
For example:

• one life
• two lives
• a person’s life
• several people’s lives
  The spelling changes from f to v before the plural ending.
  Similar examples include:
• wife → wives
• knife → knives
• leaf → leaves
  This is why their lifes is incorrect.

Their Life vs Their Lives Comparison Table

Expression	Meaning	Example
Their life	One person’s life, often with singular they	Every student should enjoy their life.
Their lives	The individual lives of two or more people	The students returned to their lives after graduation.
Their lifes	Incorrect plural spelling	Avoid this form.
The key question is:
How many people does their refer to?
If it refers to one person, use life. If it refers to multiple people and their individual experiences, use lives.

When to Use Their Life

Use their life when their refers to a single person.
This is especially common with words such as:

• someone
• anyone
• everyone
• everybody
• each person
• each student
• a person
  For example:
  Everyone should have the freedom to choose their own path in life.
  Although everyone refers collectively to many people, grammatically it is singular. Therefore, their life can be used when discussing each person individually.
  More examples:
• Everyone deserves to enjoy their life.
• Each student should manage their life responsibly.
• Anyone can change their life through education.
• Somebody has forgotten their life story book.
• Every person should value their life.
  In these examples, their is singular and life remains singular.

When to Use Their Lives

Use their lives when their clearly refers to multiple people.
For example:
The volunteers dedicated their lives to helping others.
Here, volunteers is plural, so lives is also plural.
More examples:

• The brothers have very different lives.
• The children risked their lives to save the animal.
• The workers returned to their lives after the project ended.
• The couple built happy lives together.
• The athletes balance their professional and personal lives.
• The students shared stories about their lives.
  In each example, multiple people are involved.

Their Life Can Also Describe a Shared Life

There is another important situation where their life can be correct even when their refers to more than one person.
When two or more people are considered to have one shared life or lifestyle, life can sometimes be treated as a collective concept.
For example:
The couple built a quiet life together.
Here, a life refers to the shared lifestyle or existence they created together.
Similarly:
They wanted to start a new life together.
The phrase a new life describes their shared future rather than counting each person’s individual life separately.
However, if you are emphasizing each person’s separate experiences, lives is more appropriate:
After the divorce, they went on to build separate lives.
This distinction is subtle but useful.

Their Life vs Their Lives in Common Sentences

Consider these examples:
Every child deserves a safe life.
This talks about each child individually.
The children deserve safe lives.
This emphasizes that each child has an individual life.
Both can be grammatically possible depending on the sentence structure and emphasis.
Another example:
They changed their life together.
This suggests a shared lifestyle or situation.
They changed their lives after moving abroad.
This emphasizes the individual changes experienced by multiple people.
The choice depends on meaning, not simply on the word their.

Common Mistakes

Mistake 1: Assuming Their Always Means Plural

Many learners believe their can only refer to multiple people.
That is no longer correct.
Modern English commonly uses their for one person when the person’s gender is unknown, unspecified, or intentionally not stated.
Example:
Someone left their bag in the classroom.
Here, someone is singular, but their is natural.

Mistake 2: Writing Their Lifes

The plural of life is lives, not lifes.
Incorrect:
They risked their lifes.
Correct:
They risked their lives.

Mistake 3: Using Lives for One Person

If their refers to one person, use life in the ordinary singular sense.
Incorrect:
Every student should take care of their lives.
Better:
Every student should take care of their life.
However, some contexts may use plural lives rhetorically or when discussing multiple aspects or stages, so context always matters.

Mistake 4: Ignoring the Shared-Life Meaning

When two people are acting as a unit, their life can sometimes refer to a shared lifestyle.
For example:
They built a peaceful life together.
This is natural because the phrase describes their shared existence.

Mistake 5: Choosing Based Only on the Word Their

Do not decide between life and lives just by looking at their.
Instead, identify what their refers to and ask whether you are describing:

• one person’s life
• several people’s individual lives
• or a shared life

American vs British English

There is no significant difference between American and British English in the basic use of their life and their lives.
Both varieties use their as a singular gender-neutral pronoun and as a plural possessive determiner.
For example:
Everyone should be free to live their life.
This is natural in both American and British English.
Likewise:
The families returned to their lives.
This is also standard in both varieties.
The major issue is not regional English but the number and meaning of the people being discussed.

Their Life vs Their Lives: Which Sounds More Natural?

The most natural choice depends on the noun or pronoun that comes before their.

Singular Context

• Everyone should enjoy their life.
• Each person has their own life.
• Someone is living their best life.

Plural Context

• The students are enjoying their lives.
• The families returned to their normal lives.
• The athletes have busy lives.

Shared Context

• They built a new life together.
• The couple started a new life abroad.
  These patterns can make the difference much easier to recognize.

Synonyms and Related Expressions

Depending on the context, you may encounter related phrases such as:

• their own life
• their individual lives
• their personal lives
• their everyday lives
• their family life
• their professional lives
• their private lives
• their new life
• their lives together
• live their own lives
  These expressions are especially useful in writing about relationships, careers, education, personal development, and everyday experiences.

How to Remember the Difference

Use this simple memory rule:
One person → their life
Multiple people → their lives
Then remember the special shared-life situation:
Multiple people + one shared existence → their life
Examples:
Everyone should enjoy their life.
The students returned to their lives.
They started a new life together.
This three-part rule will help you make the right choice in most situations.

FAQs

1. Is it their life or their lives?

Both can be correct. Use their life for one person or a shared life, and their lives when referring to multiple people’s individual lives.

2. Is their life grammatically correct for one person?

Yes. Modern English commonly uses their as a singular gender-neutral possessive determiner.

3. Is their lives grammatically correct?

Yes, when their refers to two or more people and you are talking about their individual lives.

4. Is their lifes correct?

No. The plural of life is lives, not lifes.

5. Why do we say their lives instead of their lifes?

Life has an irregular plural form. The correct plural is lives, similar to wife → wives and knife → knives.

6. Can their life refer to multiple people?

Yes. Their life can describe a shared life or lifestyle, especially with expressions such as They built a new life together.

7. Is their life American or British English?

It is standard in both American and British English. There is no significant regional difference in this grammar point.

8. How do I know whether to use life or lives?

Look at what their refers to. One person’s life normally takes life, while multiple people’s individual lives take lives.

Summary

Both their life and their lives are grammatically correct, but they communicate slightly different ideas. Their life is normally used when their refers to one person, especially with singular they, or when multiple people are being described as sharing one life or lifestyle. Their lives is used when their refers to multiple people and you are talking about their individual lives.
The most useful rule is simple: one person → their life; multiple people → their lives. Also remember that the plural of life is lives, never lifes. American and British English follow essentially the same rules, so the choice depends mainly on number and meaning rather than regional variety.

Actionable Takeaway

Before choosing their life or their lives, identify what their refers to. If it is one person, use life; if it is several people with individual lives, use lives. For a shared existence, their life can also be natural.