Speaking from mere experience, I think the best is to go out there and explore people where you're most curious about.
I randomly started attending conventions, conferences, etc. of things that I was interested in (or
things I never had an interest in before, but I was curious about!), when I was like 17 years old and met many interesting people, including many mature women... (sometimes even very young, sometimes my own age, but very energic and ambitious, with a career etc.) ...alas, unfortunately I'm not mature enough.
Perhaps you'll be luckier than me
Jokes apart, I think traveling and discovering the world, going to new places in your own city, talking to people, is the best way to get to know new people, including who fits your own preferences in a partner
