Although Gary Recognizes That He Is Generally Relaxed and Confident,it

Although Gary recognizes that he is generally relaxed and confident,it bothers him that there are times when he is nervous and lacking in self-confidence.He wonders why he can't be confident all the time.Based on this information,how old is Gary?

A) about 7 years
B) 13 to 14 years
C) about 15 years
D) 17 years or older