I'm 55 and have only been playing bass guitar for about 8 months, but the seeds were planted many years ago.
I started on piano at age 10 and when school band/orchestra became an option in 6th grade, I opted for string bass - I'd wanted to play drums, but that was vetoed by my parents. According to my parents, I had rocked myself in synchopation to their rocking of me as a baby, so I guess I was craving groove, so bass was my second choice.
That didn't go far, though, because the string program got cut and we didn't own the bass, and I was too clueless to realize there was such a thing as a bass guitar. I did realize my two main goals on string bass, though: I could carry it to school without using any hands, and I could spin it during rests without losing the beat.
Later, I took up harp, got interested in renaissance and baroque music and played early harps professionally for awhile. But with that, I was mostly interested in basso continuo - improvising bass line and accompaniment over a chord progression - and always lusting after the theorbos I was playing with.
A few years ago, I really got interested in blues and related stuff and started playing guitar, mostly fingerstyle country and delta blues. But I had bought a cheap bass for my classroom (I keep instruments on hand for my 5th graders in case they have a need to groove at any point) and last summer, I decided to take it home and do something with it. I took a beginners bass class and have been crazy for bass every since.
I've played in a rock class and a blues ensemble class, play along to my mp3 player all the time, and last night, played out in my first blues jam. It was very cool to just be able to play along with whatever songs the other people were introducing. And, horrible singer that I am, I even lead a song and played a reasonably interesting bass line at the same time ("The One Least in Love" - Jason Ricci).
So, I'd say, it's never too late to start, but it also helps that I've been playing something all my life. I'd love to find a way to gig again, and will keep my eyes and ears open, but I'll be happy to find a group of like-minded people to just jam with. In the meantime, just playing makes me incredibly happy. And I'm making sure that every kid playing string bass in my school knows about bass guitars (and I'm also teaching them how to carry their basses with no hands
