Our son grew up sailing too, since he was 18 days old. Sailed his own opti-style dinghy at a young age, moved onto the family racer before his teens.
Now 24, he is a sought after crew on a number of local raceboats, here and in Seattle, and after marrying last winter, he and his bride turned around and bought their first boat (Ranger 29) within a couple of months! Talk about priorities!!
Anyway congrats, your son will be graduated and on his own before you know it!! Enjoy it now.