I may actually narrow the age to around 18-24ish as it is a military organization. But if you'd like I can offer a position as a outside vigilante or possibly a Sanctum Officer (depending on how the character plays out), though they'd have a smaller role. If you wanted to do this though, you could make a character for the group and have them related (not literally) in some way to your older character, and have the character appear in your missions (if you ever create any).