How many obese old people do you see?   My grandmother was one. She lived well into her 70s and was shaped like a 5' tall beach ball. For the last ~25 years of her life (she died about 10 years ago) she either used a walker or a wheel chair to get around. She got the beetus, she got glaucoma, and she was full of more fat logic than any other person I've ever met. Her quality of life was nothing. Her own husband refused to be around her (my grandfather, who has always been fit) but wouldn't leave her for religious reasons. Her daughter was forced to take care of her, clean her, feed her, and basically be her slave.  Fat old people exist. They're just a huge burden on those around them and it tarnishes any hope of having good memories of them.