As an older single, I would have to agree with the other singles on this thread that the Age Gap is not the primary cause. If it were up to me, I would have more mixed events where people could meet each other. Not just singles. Singles events feel too contrived. An event that is open to PEOPLE will have a good mix of singles and married people. The singles will meet each other and will meet married people who might know other singles who aren’t there.
A good type of event would be some kind of shiur with a refreshment/mingling period after. This also gives people an automatic topic to talk about (the shiur) so they have something to fall back on if conversation has a lull.