Brulen, its not a matter of going stagnant but rather one of physical aging. I can’t run as far or as fast as I could 25 years ago. I can’t lift as much weight or move as fast. I’ll be exhausted after a day of physical labor now. 25 years ago I wouldn’t have. As I said I’m in pretty good shape for my age and I exercise (both aerobic and strength) almost every day at a fitness club in town, but I’ll never again be what I was 25 years ago. Fortunately the brain hasn’t begun to dim yet and I can still learn new things. Also fortunately I am not on any medications. That will be a huge problem for older folks should they wake up one day and the pharmacies are all closed. For most people getting older is a negative come most SHTF scenarios.