Miasmom, I wouldn't push the exercise thing at least until after he stabilizes. I have a mild case of MG and I tried exercising for the first 3 months and it just made me more wore out and it also didn't give me a true measure of where I should be with mestinon. I was taking too high a dosage and that made me worse as well. After I quit exercising I was able to take half the dose and my droopy eye along with my throat tightness have all but gone away. I still don't exercise now as I work full time and I have a 2 year old granddaughter that lives with me. That is all the exercise I can handle. I am also 55 and was diagnosed Thanksgiving weekend of last year.