Well, if that retiree wants to get good, strenuous exercise, and keep their reactive reflexes sharp, the could retire to San Francisco. There, they would be getting a good physical cycling workout, by pedaling up, and down, and up, and down, and up, and down, (etc.) all those steep hills there. They would also have to keep their reflexes sharp, by swerving left, then right, then left, then right, then left, then right, (etc.), to dodge all those stinky brown piles in the street.
They could also increase their deep spiritual and philosophical fulfillment/satisfaction, by tossing various objects (large gobs of ice cream?) towards N. Pelosi's modest domicile there.
Yes, I was just going to say...bicycle away, but watch out for the poop.
Human, dog , cat, probably raccoon...etc.