Well one of my best friends is an old school friend, plus I still have regular contact with a few others and sporadic catch ups with many others school friends.
My adult friends don't know as much about me, I guess. I have work friends, mothers group friends, friends I lived with overseas, gym friends and I guess they all know me in a different way. Although, they'd all probably say I was loud and straightforward
I do see my friend from mothers group the most. Apart from my gym friends and mothers group friends, I don't have any other groups of friends close to me at all. Work friends are at least 50km away, school friends about 100km away.