Mario, I just recently asked my doctor about glucosamine, because for years we were told as diabetic that we were not to take it, because I mean glucose is right there in the name. However, more recent research has shown that it will NOT elevate blood sugars, so I will grab a bottle and see how it goes after 30 days or so.
I have one of this type hand strengthener.
But the rubber type that act by you stretching outward would be good to have too to flex against tension in both directions.
I searched for "fountain of youth" but I only got a picture of an old guy and a link to a movie called Cocoon.....