In Charlie X, Rand introduces him to Yeoman third-class Tina Lawton who is the same age as Charlie, 17. It's unknown what her rank is, or if she is enlisted. We can assume she's enlisted, because 'third class' as a rank doesn't sound like an officer. It's also unknown (to me) if enlisted personnel go through Starfleet Academy as well, or if they go through a 'space boot camp' sort of training.
Regardless... Lets assume for a moment that Yeoman Lawton went to Starfleet Academy. We know the academy is a four year school... If Lawton went through the academy, she would have joined at 13 years of age or younger. Since the Enterprise had already been out there in deep space for a bit, it's safe to assume that she joined up even earlier than 13.
We know from TNG that Wesley Crusher first tried to join the Academy at age 15, but they found him annoying. (Or some other reason. Unimportant, really.)
Yeoman Lawton is an interesting one indeed.
Regardless... Lets assume for a moment that Yeoman Lawton went to Starfleet Academy. We know the academy is a four year school... If Lawton went through the academy, she would have joined at 13 years of age or younger. Since the Enterprise had already been out there in deep space for a bit, it's safe to assume that she joined up even earlier than 13.
We know from TNG that Wesley Crusher first tried to join the Academy at age 15, but they found him annoying. (Or some other reason. Unimportant, really.)
Yeoman Lawton is an interesting one indeed.