@Hudson1984 's post above sounds a bit like me! Apart from the hip.
I think it's a fairly typical story though. As we get older our social activities and hobbies are displaced with the mundane or necessary. Work harder, spend more time with family, fix the house up, and reduce or stop doing the hobbies or sports, and then lose touch with friends.
Family fills the gap, and I'm grateful and blessed with a truly fantastic wife and son.
I travel the world through work. A lot. I get to visit some amazing places and as a result I know 1000's of people. I've worked hard, and maybe I'm a little lucky that I get to meet so many. But I don't have a single friend. I'm talking about 'can you donate me a kidney' type friends :)
Just lots of used-to-be-good-friends-and-colleagues from my younger days who connect occasionally, maybe get a beer, then we get back on with our lives. I barely know my neighbours names either.
Apart from the family stuff that I love, my hobbies are solitary. I'm a target shooter (alone). I make ammunition (alone). I brew (alone). I make electronics stuff (alone). I collect retro video games (alone).
Maybe it's because I am approaching a big birthday, but I'm bothered by this. And you know what... it's 100% all on me. You've got to make the effort, and I don't. Because I'm *busy/stressed/travelling/making excuses.
I am planning my funeral for 50 years time, and I hope that some of you can make it. Otherwise it's just me, a hole in the ground and a few thousand empty .357 brass cases to fill it in with.
See you at the pub!
ps I'm O+ for the kidney thing.