Not yet officially an adult, yet feel most of the pressures of being one. Either you're applying for college or you're in college, have serious relationships, have a job, etc. You begin to transition from a defenseless child to one of society's bitches.
14 year old: OMG, dude you're 17 now! You can see R rated movies and stuff! I wish I was you.
17 year old: Uh, yeah I wish I was a little kid again.