He's 77. Every day could be the one he retires or gets retired. The football calendar is irrelevant.
iirc, if you make it to 77 as a man, you have a 4.4% chance of dying and a life expectancy of abt 9.5 years. liking those numbers guys! go cats.
Also, I'm pretty sure that compared to most American males his age, Snyder is in pretty damn good physical shape, and has some high quality health care. Thus, those numbers mid get improved just a bit.