My son is 14 and a half years old and has a 7 inch penis. will it grow longer? i personally would be happy of it did.

A good length...: A 7-inch long penis is at the high end of "normal" which should serve him well in mating and voiding. In fact, physical growth comes to halt soon reaching adulthood which is roughly at 18 for men. After that, all men have to adopt & adapt to whatever life might have brought to them. So, he is well and sound, and don't make any hint to his penis but reassure and support him for unfolding better...