He does make a good point imo. Look at Sonny and Cigars. Sonny has spent decades in jail and he is still going strong. Cigar spent probably half of his life in jail and was still going strong when they finally killed him. I'm sure there are other examples where weaker minded individuals had their life cut short due to the mental stress.

People I've known came out of jail looking much better after spending 2 or 3 years inside but that most likely had more to do with them not having access to meth, actually sleeping more than a few hours a week and eating three times a day.

All said though I don't think people are ever going to be lining up to go to the can just because they are old and don't have healthcare.