How do you actually meet new people as an adult?

Like seriously how? When you’re a kid or teenager, there’s clubs for this kinda thing. Martial arts clubs, boxing, dancing whatever. But what is there for adults? Please don’t mention nightclubs and pubs as that goes against my religious principles. I think those type of places have the most soulless people tbh religion or not. I feel like your 20s are the weirdest ages to be. Usually adult clubs or events near where I live tend to have middle aged people or people much older than myself in them. Is it worth going to these kind events when I’m only a young 20 something? Age shouldn’t really be much of an issue when making new friends right? Any advice is welcome.