+1, Indy.
I haven't encountered any jealousy, just my one friend (the one who I have written about here, that I can't tolerate much anymore) who told another mutual friend that she couldn't understand why I would choose to go back to work/school when I didn't have to. In a way, she's jealous, because she always talks about what she is going to do, but then says she "can't."
My dad worked until he was 85 (he's almost 88), mostly to supplement his social security, but also to keep him busy. He's going a little nuts now, being at home. My grandfather worked until the day he died, at 91, from the after effects of a car accident. His colleagues were constantly asking him when he was going to either retire or die (), as they wanted his customers. He sold scrap metal although he had gone to law school, and he actually was not that financially successful until he was well into his 60s.