What is a friend? When I was a kid, the requirements were none too stringent. Is he in my class? Can I ride my bicycle to his house? Do his parents have any insane "not too much candy before dinner" rules?
As I got older, other factors became more important. Do we root for the same team? Are we willing to lie to our parents for each other? Does he have a bong?
Now that I'm one half of a couple (actually, 49 percent when it comes to decision making, 51 percent when it comes to heavy lifting) friendship is trickier. Are our children the same age? Do our families have comparable incomes? Do they have a bong?