You guys have some nerve, trying to extend your careers. I mean really, how about a little consideration for those younger guys, whose seats you've taken.
Next you'll be talking about depends and drool towels for those over-water flights.
Seriously, if you need compression socks, what's next, exercise? Just because you can die from a spontaneous blood clot, doesn't mean you should actually do something about it. I think that retirement, immediately, is a far better option, and if you don't believe me, just ask someone junior to you.
However, failing that, here's a really good article on the subject:
prevention of air travel blood clot fatalities
JJ