Sport: Golf
Retirement Age (Career Length at the Time): 28 (1920-1930)
The only man to ever complete golf’s Grand Slam in a single season (Sorry a “Tiger Slam” doesn’t count here) was only 28 when he swept the year’s majors. After the best year in golf history, Jones retired. If you thought Babe Ruth calling his home run was badass, then what Jones did was some next level shit.

Prior to his Grand Slam, he bet $1,200 on himself winning and with 50-1 odds he cashed out with $60,000. Maybe that explains why he retired. Outside of the Grand Slam, he dominated his entire career to the tune of winning 13 of 31 majors he competed in. If Jones had kept playing, Tiger would probably only be halfway to the all-time mark.