If you can find a place tangentially related to an activity you’re interested in (outdoor store, game shop, etc), you can usually find folks who are always down to include others in activities. That’s kinda how I made friends through mountain biking. Granted I still spend a decent amount of time with dudes older than me, but I’ll take it. I’d also check Facebook for groups in your area for activities you like. You may not find folks around your age, but it’s a start.