The issue is not that people's brain degenerate. Cause the rest of the body is physically degenerating too. And most people would naturally die by the time they hit retirement age before symptoms of mental decay show up, as was the case before we got modern pharma and surgical procedures.<p>But since we have more fixes for physical degeneration than mental degeneration, we see most sedentary people kept alive through medication and constant surgeries well into their 80s and 90s while there is nothing much to reverse whats happening to the brain.<p>Having worked for a while at a hospital, I feel people who really haven't lead active lives or are just naturally less active or don't like too much activity fall into this trap, where the medical system will keep them physically alive for few decades longer than in the past. They need to be told this could be a trap. Instead we keep them alive, let their brains degenerate and study them like lab rats.