How old is Carrie?

All it says is that she is a teenager, but I would say 16 or 17.

In one of the special features they say she's 16.

One Flew Over the Cuckoo's Nest-6/10
The Secret Life of Bees-7/10

She has to be under 18 to be required to go to a foster home or go live with dad. I assumed she was 16. They might have said that in some dialog.

TxMike
Make a choice, to take a chance, to make a difference.

Born 1983. The movie was released in 2010.
16? Check your math!