It helps that he won three Olympic gold medals in Rio and is still 21 years old .
And then , he will turn pro , and Murphy has gone on - record in saying that he hopes to keep swimming for as long as possible .
It helps that Murphy won three Olympic gold medals in Rio and is still 21 years old .
And then , he will turn pro , and Murphy has gone on - record in saying that he hopes to keep swimming for as long as possible .