Fair enough, but I think there are a range of other factors that often get left out of the argument, factors which if neglected can totally destroy other efforts.
At the least I'd list:
- Sociability / sex
I just saw this study that stresses the importance of social contact.
Loneliness and the Rate of Motor Decline in Old Age:
Among community-dwelling older persons, both feeling alone and being alone are associated with more rapid motor decline, underscoring the importance of psychosocial factors and motor decline in old age.
The whole study is available at this link.
You need your tribe