What is normal pain?

It is strange that, as I get older I develop more pain. It didn't happen suddenly
but so gradually that it is barely noticed and becomes the normal way of feeling. So, when the doctor asks if I have pain, I say not really. But actually I hurt everywhere...hands, feet, right elbow, back, shoulders, shoulder blades, forearms, calves, ankles, one knee....When I sit still, I throb, and burn and occasionally stab with pain. I'm so used to it...I try to ignore it. Should I be putting up with this pain?...I assume it is the way everyone feels at my age.
My fingers don't look like my fingers anymore. I have lumps and bulges that weren't there before...hard bony bumps that distort the former gracefulness of my hands. They look like old people hands with tiny wrinkles or crinkles all over. Those hands are fighting a good fight to keep supporting my need to schlep stuff. More about schlepping later.
How'm I doing with trying to write more regularly?