I think the major thing is that you don't necessarily get to choose what happens to you as you age. My Fil is in his early 60s and can't walk across the room without becoming winded thanks to his heart getting messed up. My mother, also early 60s has through no fault of her own completely shot knees and her standing is limited to walking between places to sit.

Their respective spouses are doing great though so they're legitimately carrying the team.