The first two links are just articles that list health reasons as a top 5 reason why people retire. The last link has some stats for you.
And, these were easily gotten...many more links with stats on this. Easy for you to have gotten. I'm not one to throw out stats for every assertion I make, and I don't make them based on lack of evidence.
You've actually got the retirement versus death age thing backwards: The earlier you retire, the longer you live. This is from a study funded by Boeing:
And this is why the #1 thing the mutual fund industry doesn't want to talk about--long term rate of return--is important.