Became a USN officer @ age 24. It was more or less my "family business." My only regret is that I'm no longer in the service.
HOO-AH!
I screwed around for quite some time. Kept my dependent's ID by attending just enough college to remain eligible. The day they took it away was really odd. I signed up for Army ROTC a year or two later later, mostly at the urging of CSM Gamecock who told me "Son, be smart and get a commission." He got my silver daughter after I was commissioned. He kept it by his bedside til he died 10 years later.
My 14 year old daughter just announced that while she doesn't have any intention of joining, she will marry a soldier one day. (Hope she doesn't have him picked out just yet.)