You have friends who have kids. Saturday mornings are for sleeping. You are taller than the slide at the McDonald's playland. Your parents' jokes are now funny. You have owned, and since disowned Michael Jackson's Thriller.
Naps are good.
Hitting girls is no longer considered flirting. You actually buy scarves, gloves, and sunscreen. You leave concerts and ballgames early to beat the crowd. You don't want a Camaro becuase of the insurance premiums. You've bought an album on vinyl.