And in a way the Scottish swimmer could be considered the quintessential seventies sportsman ahead of Kevin Keegan or Henry Cooper. When everything considered cool was American, from Charlie's Angels to The Eagles, the tall Edinburgh-based student crossed the Atlantic to train and study in Florida and picked up the accent.
He even looked American due to his centre parting, moustache and choice of interesting knitwear.
Wilkie seemed to bring a seventies laid-back temperament to his sport at odds with today's ultra-competitive win-at-all-costs mentality, even though he was competing at the highest level by winning Olympic medals and breaking world records.
But the reason why Wilkie has come to encapsulate the much-vilified decade is that he walked out of the public eye at his peak. After winning the Olympic gold in the 200m Breaststroke at the Montreal Olympics in 1976, he retired. He did not grow old in the public eye and so Wilkie will be remembered forever as the young moustachioed swimmer and for the general public will forever remain 22 years old.
He spent his first 11 years in Sri Lanka before moving to Edinburgh to go to boarding school at the David Stewart College and then moved to America as an 18-year-old to go to university. It was little wonder that he should lack a distinctive Scottish voice. It did not make him feel any less Scottish.
He said in a BBC interview in 1976, while at college in Miami: "I will always remain Scottish, no matter what happens, even though my accent changes, even though I live in this country, I still maintain I am Scottish.
"I always will do, even though I have only lived half my life there."
It's fair to say that if his parents had not decided to move to Sri Lanka before he was born, he would not have made it as a world champion swimmer. As a child he would stay in the pool for hours on end or go down to the beach and swim in the sea. This would have been far more uncomfortable for the young Wilkie if his parents had chosen to stay in Aberdeen rather than move out to the Far East where his father worked on a tea plantation.
But Wilkie's laid-back attitude may have brought his fledgling career to an early end. He got into trouble at the club on a number of occasions for missing training sessions. And he struggled to get out of his bed to make the early morning trainings sessions.
But when Wilkie was only 12, the club's coach Frank Thomas spotted something in the ex-pat, although it was not until 1970 that the promising swimmer began to shine. Between 1969 when he won the Scottish Junior title and 1970 when he won bronze at the Edinburgh Commonwealth Games, Wilkie shaved an incredible 30 seconds off his time in the 200m breaststroke.
It was his performance at the 1972 Munich Olympics when the 18-year-old came from virtually nowhere to take a bronze medal that he began to really show what he was capable of. The performance won him more than an Olympic medal. The University of Miami who had been monitoring his progress decided to offer him a sports scholarship, which enabled him to train every day whilst studying for a marine biology degree, which he soon switched for a degree in English and Mass Communication.
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