Good advice from marketwatch.com: Five great lessons for retirees - MarketWatch
"I'm not advocating poverty, of course, and I work hard to help people save and invest wisely so they will have more resources. However, I've known many people who are very happy even though their means are quite modest. And I've seen many others who are unhappy, sometimes even miserable, although they have much more than enough money.
The lesson is this: Once you have met your basic needs, your happiness depends more on your attitudes and your behavior than on the size of your portfolio and your bank account."