Muhammad Ali & Deion Sanders
Muhammad Ali after his glorious journey retired at the age of 37 and came to be known as a living legend and a three-time champion. Though he returned to the ring, he finally retired in 1981. Deion Sanders signed with the Washington Redskin in 2000 but suddenly retired a year later and remained retired for three years before signing an ally with the Baltimore Ravens when he was 37. Finally, Sanders retired in 2006.