Where are all the good friends gone?

Did you feel it too or I'm the only one? Times goes by, people move to other country or get married, you start working...and one day, suddenly, you find out you have no longer this big group of friends and this small group of very-very good friend you used to hang around on saturday afternoons talking, shopping, having a coffee...and it's so difficult to make new friends when you're over 30!!! Why? Do we loose the charm and humour? Or is it that we just turn crusty and lazy?...