I moved here in my early 30s and did a terrible job at meeting people. Having kids worked wonders - but if I did it again:

I'd show up to howard county striders (running group) every week and hang around for bagels after. They are out there literally every week, and a great group. Alternatively, there are a bunch of sports leagues and exercise classes out there worth checking out. Some (like Barre) attract younger people, where as the kettlebells class I did with my wife, we were the youngest by at least a decade or two.

Check out Columbia Associate AND Howard County Parks and Rec to see what types of classes are offered. There is a bunch of stuff targeted at adults that could be fun and a great way to meet people.

There are a lot of volunteer groups too. Find something you care about and show up every week.

Howard county community college does have classes available for reasonable prices that aren't college centered (art, photography etc).

A friend of mine travels from a few towns over to be part of the Howard County Orchestra... granted, you need some real talent.

You could always consider getting a part time job at a brew pub or seasonal job at retail in the area.