I don't think anyone has expressed an interest for about 15 years (I'm 46). But I've never really made an effort to meet people and at this point, I don't think I could manage going out with someone or living with someone again.
The relationships I had in my 20s weren't really relationships. They were all quite short and they made me constantly unhappy and insecure. To be honest, I seemed to get stuck in a pattern where I thought we were in a relationship but the other half thought it was a convenient stop gap till they met a genuine candidate. I guess I was unlucky that I didn't happen to meet anyone who really liked me, but I didn't, and those situations were very destructive.
The last few times I started going out with people, I was actually waiting for them cheat and I decided that I should get my head into a better place where I could trust someone and relax into being happy. Perhaps I still haven't 15 years later.
When I went out with people I was very jumpy and unhappy and when I'm single I'm very calm emotionally. I've never had a long term relationship and I've never had a happy one and I've been single and celibate so long it makes me very embarrassed, and sometimes that depresses me. Sometimes it makes me feel that I'm inadequate or unloveable, but I'm happier alone than I am being with someone else, and having had quite a lot of emotional turbulence in my teens, 20s and 30s, I really value the calm I now have.
I really enjoy being able to come and go as I please and do exactly what I want without having to tell someone I won't be home til late or check if they want to watch the same TV shows. I like to be able to eat odd things for dinner if I want to, or spend a rainy day in bed reading undisturbed. I really hate the idea of having to negotiate on things like furniture and pictures. When I was in a relationship I wasted a lot of time making sure other people were ok and not worrying about how I was doing.
If I meet someone single, I just assume they're single. I don't make any other assumptions about them. At least half the people I know are single, some long term, some just for the moment. They aren't noticeably misfits and there is no thread that connects their singleness.