Brett Favre retired, then unretired with the New York Jets.
Sound familiar? Think Dana Torres who is 41 is competing as a swimmer in the Olympics and has a good shot at gold.
Think Michael Jordan, the best basketball player of all time, retiring to play baseball and then coming for more championships, retiring again, coming back and flopping.
Think Roger Clemens who was the king of retirement. Retired in 2003, came back in 2004, quit in 2006, came back before finally retiring for good.
More Stats +/-
Age Appropriate Styling
In Japan: Retire, Get Divorced
Bill Gates' Video Parodies His Own Retirement (CES 2008)