You usually see guys make more money in endorsements as they...

You usually see guys make more money in endorsements as they get older even if their skills are diminishing. By then they're known quantities, not just to the public but to corporations. These corporations are very risk-averse, and they like to know that they can trust these guys. Athletes who have already had long careers without scandals are safer, whereas a 23-year-old is seen as more likely to get into trouble.