Nowadays parents treat their children more as equals than they used to and the child is given more freedom to make his or her own decisions in life.
Whenever Beth's parents have guests, she wants to join their adult talk.
She will grow up to be a very good pianist.
She grew up to be a famous doctor.
She is an adult, so you should treat her accordingly.
They will be accepted by their peers in adulthood.
They aren't children any more, but not adults yet.
As he grew up, he learned to put things in perspective.
He makes a fool of adults.
He is approaching manhood.
He will be a doctor when he grows up.
He wants to be a tennis player when he grows up.
He treats me as an adult.
He is older and wiser now.
He grew a beard to look more mature.
He is, as it were, a grown up baby.
His niece is attractive and mature for her age.
The town in ruins, burning, people and children being killed.
The railroad fare for children is half of the adult fare.
It is impudent of you to make fun of adults.