"You are seventeen years old."

Translation: Тобі сімнадцять років.

[Misslv007]

Is вам сімнадцять the same or different?
If same, what instance would you use either?

[DamirN]

Is it possible to say "тобі сімнадцять" without "років"?

[deactivated user]

Yes, it's possible.