Barry Sanders – 51

Barry Sanders was a great football running back who played for the Detroit Lions of the NFL. The Lions drafted him in 1989, and throughout his decade-long career, Sanders stuck with them. When he retired in 1999, Sanders was only 30 years, free of any injuries, and flourishing in the field. His decision shocked everyone, but 20 years later, Sanders told Forbes that he has no regrets. Since his retirement, Sanders has appeared on television a few times, like the time he introduced Monday Night Football on ESPN in 2011. Today, he is 51 years of age and has been out of the radar for a while.