Physical Fitness is a MUST!
I still work out, trained in martial arts, stay active, and am not overweight - but know what??? Most guys in good shape in their 20's can probably kick my butt in a fair fight. Key word - fair. Heck, my 12 YO who is 5'7" (gotta be the German side of the family) would probably give me a run for the money strength & endurance-wise! Getting old sucks, but thankfully we have other tools available to even things out.