Sir Stanley Matthews
Experts believe there's a direct link between a man's testosterone levels and his competitive edge. This may explain why some players decide to retire since they just don't have the "drive" they once did.
Testosterone declines with age, as proven by scientists from the University of Manchester Department of Medicine in the UK, who state, "There is an underlying decline in both total-testosterone and free-testosterone index...with advancing age."
One man's career that arguably disproves this theory is that of the English footballing legend Sir Stanley Matthews.
Playing his last competitive match at age 70, he was the oldest player ever to play in England's top football division and the oldest player ever to represent the country. Trying to make sense of his unbelievable career, football historians often cite his teetotal, vegetarian diet to be the reason for his longevity. However, few mention his penchant for a cigarette, which probably disproves that theory.
So there you have it: five players who've defied science and the ageing process. Some outwit Father Time like Ryan Giggs. Others take him on with their superior genetics like Roger Milla. But once in a while there comes along a legend like Sir Stanley Matthews, a man who does all of the above whilst all the time smiling and smoking a cigarette.