How do you say I am 56 in French?

There are two ways to say "I am 56" in French, depending on the context:

Formal:

* J'ai cinquante-six ans. (This is the most common and formal way to say it.)

Informal:

* J'ai 56 ans. (This is more informal and can be used with friends or family.)

Both are grammatically correct and understood. The choice depends on your level of formality and your audience.