Bulletin Today | Personal HealthThose who have lived to be 100 have some advice for you young whipper-snappers in your 50s who want to reach the century mark: Sleep longer and eat a more healthful diet. That’s the finding from Unitedhealthcare’s annual “100@100 Survey,” which for the first time looked not only at the century-old group, but also at boomers age 50 to 55. As of 2010, the Census Bureau estimates there are 72,000 Americans who have lived 100 years or more. By 2050, …