(((Starry)))

Yes, it can be harder to make friendships when we are older. I can identify with that, definitely. All I can say is it's very unlikely to be a reflection on you but as we get older many people are settled in friendships, busy, and 'full up' as I once observed (no time for new friendships), then there's compatibility which can be every bit as complicated as the romantic kind.

All I can advise is keep on doing what you are doing, get out there, meet new people (when you can and have the energy, because that's an issue for introverts), you will increase your odds of clicking all the time. I had no friends for ages and met 4 very good ones within the space of a few years, and 3 of those were in the same interest group. You never can tell what lies around the corner.