By Luke Stenis

Ever wondered what your favorite professional athletes do after they retire?

Considering the average retirement age of an athlete from their sport is 33 -- and 28 for the NFL -- there is still a lot of life to live after the spotlight is removed.

While many retired athletes go on to excel in other career fields, a few buy back into the fraternal order of professional sports, investing in franchises they either played for or admired over the years.

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The star athletes on this list all have one thing in common: They all own a percentage of a professional sports franchise. Whether it's a minority share or significant ownership, these athletes have taken their wealth and invested it into what they love: Professional sports.

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