Those of us of a certain age are subject to a variety of aches and pains from arthritus and sins of our youth.
Aging also means loss of muscle mass and diminished strength - that's why, when I was a young man I could've kicked all your asses (except maybe Bluestrat's), but now I'm old, weak and fragile.
Playing guitar now for any length of time makes my back sore - I'm a righty, and it's the muscle next to my spine (the tenderloin) and under the shoulder blade on the right side. Happens sitting or standing, but sooner standing. I'm assuming this is due to loss of strength.
What do you guys think? And do you know how to make it better?