I wouldn't have guessed grip strength would be an accurate predictor of all-cause mortality.
I would say my keyboard hands aren't that strong 😅

But I do agree that it is good to prepare for staying fit (body and mind) at a later age.
Heading slowly towards 50 I try to keep myself fit by cycling a lot, walking and taking the stairs whenever I can. What you eat and drink is also an important factor by the way.
I recently read about the one leg balance. I thought the book was called 'Tiny habits'. It had more simple health tricks, but one of them was brushing your teath standing on one leg to improve your balance.

Your blog is a good wake up call 👍