Do you actually enjoy racquet sports, or are you mainly looking for a social outlet? Pickleball is solid for both, and yeah, it's stuck around well past the initial hype - plenty of people your age are playing it seriously now, not just casually.
Most places will let you borrow paddles and balls to start, so don't drop money on gear yet. Just show up and try a few sessions first. The one thing people don't mention enough: your shoulder and elbow can take a real beating if you jump straight into competitive play without proper form or a warm-up routine. I've seen folks get sidelined because they went too hard too fast thinking it was just a fun social game. Start easy, focus on technique before you get competitive, and you'll be fine.