Especially in your 30s, or maybe its just the friends I've had. My school friends mostly have children now and I last saw them in December. I travel to them every time, they have never been to where I live, I always go to soft play etc and accommodate them, I get 0 back. If I don't contact them, nothing will happen, but I know the ones with kids do meet up themselves still.
Join a club is the usual suggestion, and it can be useful but it's not a guarantee. I went to a women's only group called 'girlsonthego' and was the only person not in the 18-25 bracket. I do an evening class which i enjoy, there are 5 of us and I am the only person not over 60/still in full-time work.
I've been to groups suggested on the 'meetup' app, but unfortunately some men saw it as a dating opportunity even though I am married and obviously not looking, I wasn't comfortable being approached by them.
So I feel a bit lost really, I do have friends but all very casual. Sometimes I feel it's better that way because I don't get pressure to do expensive things, friends who aren't real friends, who are in competition with you, insecure, talk behind your back and so on. But it is harder if you aren't a parent, anyone got any tips? I work Saturdays so I can't do parkruns