I'm 67 and just started 6 months ago! A long lived dream (Although I've been playing guitar for several years.) May I suggest to get some bass lessons. A local music shop would be a good place to get lessons and a lot of "advice" as you make friends from going once a week. A teacher will keep you focused, advancing and motivated. Also, have the teacher teach you theory not just bass lines to a few songs you like: Like going through like Hal Leonard or a little drier version Mel Bay series. This way you will know how to play with other folks. That's where the ultimate fun begins!