Just reread this article about making friends as you get older... this quote was so interesting:

<< As external conditions change, it becomes tougher to meet the three conditions that sociologists since the 1950s have considered crucial to making close friends: proximity; repeated, unplanned interactions; and a setting that encourages people to let their guard down and confide in each other, said Rebecca G. Adams, a professor of sociology and gerontology at the University of North Carolina at Greensboro. This is why so many people meet their lifelong friends in college, she added. >>

http://www.nytimes.com/2012/07/15/fashion/the-challenge-of-making-friends-as-an-adult.html?pagewanted=all

Thee three things you need to make close friends (according to the article) are:

1) proximity
2) repeated, unplanned interactions
3) a setting that encourages people to let their guard down and confide in each other

Our closest friends that we've made in recent years are other parents that:

1) we live near
2) that we ran into all the time (either on the sidewalk or at the nearby playground) and
3) that we had playdates with (that turned into dinner dates).

So these three things have definitely been true for me and Bee! How about you?