I started playing guitar at age 60 after being a drummer for nearly 50 years. Not easy. Lately I’ve been playing bass more, which combines guitar and percussion. I recently learned the bass lick in Prince’s Sign O’ the Times (quite a thrill to play that). But even more recently I took up blues harmonica, which is fascinating and doable–I recommend it. Get a good instruction book and a Hohner Blues Harp and learn to draw on 4, you won’t regret it.