Awesome! Similar circumstances here... I was about 43-44 when I bought my first instrument which was a starter bass guitar on Craigslist that came with a tuner, cable, practice amp, and a book.
About a year later I made my one and only instrument upgrade (but have acquired 3 amps and 2 cabs in those past 6-7 years.)
By 2 years in I was scouring CL for an intermediate drummer to practice with but instead ended up nailing my very first startup band audition. We've since put out an EP and a full length, and are in process now of demo recording songs for another full length.
Band #2 started up a little over a year ago, and we're now in the mixing stage of our first album. Both bands try to play out once per month
It's funny that being in a band wasn't a goal when I first picked up an instrument. I'm 50yo now, and honestly don't know what I'd be doing in life for kicks if I didn't get to make music with these groups.
You're never too old to learn, and probably more disciplined about practicing than when we were young. Your fingers WILL be tamed and trained in time. Learning something like this comes in small steps of progress, and plateaus where you feel like you're not moving forward, but you are.
Enjoy you journey!