Well that depends on your eating habbits and the amount of excercise you get (mobility).
Will you be is usually better, but are you going to be is not incorrect.
Percy is going to be 16, and annabeth is going to be 24.
he is going to be 25 in december.
she is 9 years old and is going to be 10 years old
On the 23rd November 2012, Miley Ray Cyrus is going to be 20 years old.
46 years old
15 years old
10 years old going on 11
15 years old
He will be 20 years old
55-years-old
He was going to the cattle market.