I played Saxophone, about 20 years ago. As a Saxophone player in a rock / pop setting, you have some free time between your hooklines and your solos. Aside from singing dubious backing vocals, hacking away on cheap percussion instruments and pretending to be the sound guy, I spent this time watching the other guys in the band doing their thing.
Somehow it was always the bass player I watched the most. I have always been a groove player, even with the Saxophone, and I found the triple function of the bass (groove, harmony, melody) fascinating. Plus, the bassist gets to play ALL THE TIME, no boring pauses! And the audience doesn't really notice what you're doing, so you don't need to practice much. Just kidding.
Then the usual stuff happened. Work, business, family. No more music for years. When I decided to take it up again about three years ago, the Saxophone was not an option, because you can't play quietly with headphones (kids are asleep when I have time to play). So I remembered my fascination with the bass, bought one and began noodling around. It worked, it was fun and, just like some others, I regret a bit that I didn't do this earlier.
Last year, I began subbing in a local funk band. After four weeks I had my first gig, playing a whole set of stuff that was way over my head, which was great. It still is. Found Talkbass much earlier and learned a lot, e.g. the meaning of GAS. Thanks for that.