Naaah. You're never too old to learn something that's interesting to you.
When I was 35 (a decade ago), I decided to learn muay thai. You want to talk about reflexes and coordination?! Did that for about five year and actually got pretty good.
And about three months ago, I started studying kung fu.
On the music related front, I've been playing guitar since I was twelve. Recently, I decided to learn to sight read. I'm having to unlearn a lot of bad habit (which is THE major downside to learning something when you're older), but I'm having a blast playing pieces on the guitar that were written for other instruments.
The point is, if it's something you're passionate about and enjoy...you should go for it!