Japanese phrase
___歳です。 ___ sai de su
Meaning
I am ___ years old.
When to use it
Gives the speaker's age. This polite form is common in simple conversations with classmates, teachers, or other familiar people.
Example dialogue
何歳？ nan sai
How old are you?
ぼくは10歳です。 bo ku wa 10 sai de su
I am 10 years old.