Doesn't matter how old you get, you still need hobbies that interest you and keep you thinking. I've taken little breaks now and again when the spark dulled a little, but it came back and I'm still making 'em.
Gotta wonder what the fizzled comic artists moved onto doing.
Remember to put something under your wrist to raise your hand up, so you reduce the wrist strain you get when your forearm lies flat and your hand has to tilt up and back to use the mouse.
I have an old facecloth that I folded and rolled tight and bound with a piece of string, no kidding. It gives my wrist something soft to ride on and alters the angle of my hand so it's much more comfortable.
Vertical mice work better also, I have been told by a user, they're like raised rounded lumps that your hand flops down over, again reducing that wrist strain. Look 'em up, see if you can find a cheap one to try out.