I have a friend, the same age as me, looking into buying a house with his girlfriend. He has a nice car, already lives with his girlfriend, went on holiday to New York recently, etc., etc. I have to admit it; I'm jealous.
I've read that jealousy shows you what you desire. Well, I would definitely like to live with The Boyfriend instead of at our respective parents' houses after five years! My friend's worked very hard (after graduating a year ago) to be in the financially stable position he is in now, so I definitely don't begrudge him his situation, I just wish I could be in it too!
Then there are the customers at work who pull out their highly overstuffed wallets and peel off a £20 note from the several hundred pounds worth inside.. I definitely feel the green-eyed monster trying to escape then!
It's silly to be jealous. There are always people worse off than you and things may not be as they seem. I could have a bulging wallet if I withdrew my entire overdraft too! (It would almost be worth it to see the looks on my friends' faces actually... :D) The rich man you see may have just got an inheritance, or simply worked hard to save up for something he wanted.
So rather than feeling jealous, I suggest (to myself and anyone who wants a suggestion!) that we feel good about trying to improve our own finances and let other people worry about their own. Money can bring both security and worry, so it's best just to see it as another tool for life and find our happiness elsewhere.