Hiking club, ski club, running group/club, environmental volunteerism, discussion groups, political groups, college alum group/outings etc… He’s very young.
My oldest son met his wife by a dating app, OK Cupid. Man, she is perfect for him. It is pretty uncanny. And now the mother of my second grandchild. He was much older by the time they met and very disillusioned by that point. The rest of us HIGHLY encouraged him to try one of the match apps. I personally know several marriages that came from them.