I always took the "slowing metabolism" more as the individual slowing down. As I'm getting older and things start hurting more everywhere, I move less. Because

I always took the "slowing metabolism" more as the individual slowing down. As I'm getting older and things start hurting more everywhere, I move less. Because I move less, I have less muscles. Because I have less muscles, I burn less calories, and thus gain weight a lot easier/faster.