50 here, and also in better health than in my 40s! In fact, the year I turned 50 was the year I finally really solved my weight problem, got to the underlying metabolic defect and worked out a strategy to effectively correct it.

The year I turned 50 was also the year we became empty nesters. At first I was freaked out by it, but now we love it. We love our kids dearly, but its great to have more time for ourselves too. For me it gave me the time to figure out how to improve my health, reinvigorate my work, reinvigorate my marriage, all kinds of neat stuff happened to me the year that I turned 50 (but no new bikes with two kids attending very *expensive* private colleges)!