I am in a similar situation, but we live separately. Now I don't have stories of nonagenarians lifting weights, but as long as they keep moving in the house and

I am in a similar situation, but we live separately. Now I don't have stories of nonagenarians lifting weights, but as long as they keep moving in the house and take a gander outside every once a while, they will retain their muscle mass and remain independent. If that means crawling up the stairs every day, so be it.