The Seven Ages of Friendship (Or Six . . . Whatever)
The older you get, the longer it takes to become friends with an acquaintance: kindergarteners at the park become friends in minutes . . . in elementary school all it takes is proximity . . . in middle school you need to have a common interest . . . high school students need charisma and patience in order to infiltrate a clique . . . in college friendship is ritualized into fraternity pledging and such, and now, as an adult with a job and kids, it seems as if it takes years to get to know someone new (and you pretty much need to work with them or have kids in common or play in an adult sports league or belong to a historical reenactment society together or something drastic like that).