Also, interesting programme last week about 6 elderly celebreties with mobility / memory problems who improved dramatically when they returned to 1970s setting, when they were in their primes. Basic theory was that doing too much to help elderly people can mean they deteriorate more than if they continue to look after themselves.
I think my grandparents would agree eg Grandad was still clearing leaves out of gutter in his later 80s (and Mum prefered to know after he'd done it!), growing much of their vegetables, Grandma was still cooking, freezing food,, using bus etc into her 90s, and both collected hedgerow blackberries on walks and won many prizes of fruit, meat, chocolate, alcohol etc at whist drives.