To a certain extent, yes. I'm much older than you- probably nearly double your age- 44. But, most of my friends now have children of their own. So much of their time is now dedicated to them- as it should be. So, I've pretty much lost close friendships.
In other ways though, that's taught me an important lesson- that it's not a good idea to rely on other people. I have a solitary, socially anxious side too and it suits that side of me not to have to see people.
I suppose, I just accept it really. Growing older, all these things feel ineviatble- without monumental amounts of effort to keep friendships alive. I wouldn't want to be young again though. I'm glad that time's past!