Article in The Times today - headline is
Crosswords may hold solution to delaying dementia
I won't reproduce it in its entirety, but the gist is that "a study has found that most people who are most intellectually active in later life appear to delay the onset of dementia by as much as five years."
To crosswords I would add motorcycling and an interest in good wines. I'm sure other members of this parish can add to the list.