"Bạn bao nhiêu tuổi?"

Translation: How old are you?

[MinhManTRU]

Can we also say "ban may tuoi"?

[SheTuti]

mấy is from 0 to 10, up 10 bao nhiêu

[iblinguist]

sounds like bàn rather than bạn, to me anyway

[Sylvia_Nguyen]

Yeah you can but I think it's not as formal.

[MinhManTRU]

Thank you :)