Common French Mistakes: Saying “Je suis 20 ans” Instead of “J’ai 20 ans”

Introduction

Je suis 20 ans.

This feels logical if you are translating directly from English:

I am 20 years old.

So the correct sentence is:

J’ai 20 ans.

Literally, this means:

I have 20 years.

That may sound strange in English, but it is completely normal in French.

1. The Correct Pattern for Age

In French, use this pattern:

The English translation uses “am,” “are,” or “is,” but the French sentence uses avoir.

2. Why French Uses Avoir for Age

French often uses avoir where English uses “to be.”

Age is one of the most important examples.

This does not mean French speakers imagine age exactly like an object. It simply means the French expression is built with avoir.

The important beginner rule is:

In French, you “have” years. You are not years.

The mistake usually happens because learners translate word by word from English.

But French is not English with different labels. It has its own sentence machinery.

4. How to Ask Someone’s Age

The most common beginner question is:

Tu as quel âge ?

In a more polite or formal situation, use:

Vous avez quel âge ?

However, be careful. Asking someone’s age can feel personal, especially with adults. It is normal in classroom exercises, but not always natural in real conversation.

5. How to Answer “How Old Are You?”

Use:

J’ai + number + ans.

You do not need to say vieux or vieille when giving your age.

Je suis 20 ans vieux.

That is not natural French.

Say:

J’ai 20 ans.

Clean, simple, correct.

6. Age with Avoir Conjugation

This is why learning avoir early is so important. It appears in basic beginner sentences all the time.

7. Do You Need Ans?

J’ai 20.

In casual conversation, people may understand it from context, but for beginners, use the full form:

J’ai 20 ans.

It is clearer and safer.

8. Common Related Mistakes

Mistake 1: Using être instead of avoir

Incorrect:

Je suis 20 ans.

Correct:

J’ai 20 ans.

Mistake 2: Forgetting ans

Less complete:

J’ai 20.

Better:

J’ai 20 ans.

Mistake 3: Adding vieux or vieille

Incorrect:

Je suis 20 ans vieux.

Correct:

J’ai 20 ans.

Incorrect:

Tu a 18 ans.

Correct:

Tu as 18 ans.

Incorrect:

Ils a 22 ans.

Correct:

Ils ont 22 ans.

Small verb endings matter. They are not decoration. They are the hinges of the sentence.

For one year old, French says:

un an

For two or more years, French says:

ans

10. Mini Practice

Translate these sentences into French.

1. I am 20 years old.
2. You are 18 years old.
3. She is 25 years old.
4. We are 19 years old.
5. They are 22 years old.
6. How old are you?
7. My brother is 15 years old.
8. The baby is one year old.

1. J’ai 20 ans.
2. Tu as 18 ans.
3. Elle a 25 ans.
4. Nous avons 19 ans.
5. Ils ont 22 ans.
6. Tu as quel âge ?
7. Mon frère a 15 ans.
8. Le bébé a un an.

Summary

I am 20 years old.

But in French, you say:

J’ai 20 ans.

French uses avoir for age, not être.

The correct pattern is:

Subject + avoir + number + ans

So do not say:

Je suis 20 ans.

Say:

J’ai 20 ans.

This is one of the most useful beginner corrections because it appears in introductions, classroom exercises, oral exams, and everyday conversation.

Continue Learning with SeriousFrench

If this mistake felt familiar, review the foundations around it. Age in French connects directly to subject pronouns, avoir, numbers, and beginner introductions.

Start here:

Module 1: French Foundations

Helpful review:

French Subject Pronouns Review je, tu, il, elle, nous, vous, ils, and elles before practicing verb forms.

French Numbers 0–69

You need numbers to give your age clearly.

How to Introduce Yourself in French

Age often appears in beginner self-introductions and classroom conversations.

Related article:

How to Study for a University French Course

Useful if you are learning French for a class, quiz, oral exam, or university course.