Isso realmente soa como um episódio da versão Outer Limits (1995), "In The Zone."
Da descrição da Wikipédia:
With its deadly lasers and hand-to-hand battles, 'The Octal' is a combat sport for a new generation of athletes — but Tanner Brooks is no longer a young man. Although he's promised his wife Jessica that this will be his final tournament, Tanner is desperate to go out a winner. Dr. Michael Chen has a way to make that happen. Through an experimental treatment that taps the power of the human nervous system, Chen accelerates Tanner's reflexes and perceptions. To Tanner, everything in the Octal begins to move in slow motion ... and Tanner quickly becomes unbeatable. However, there are side effects: Jessica notices that Tanner is tired, haggard and his hair is going gray.
e
A cured but aged Tanner and Jessica look at the "explanation" Dr. Chen left to them - his driver's license, which shows that he should have been only thirty years old. They realize he had tested the procedure on himself, causing his body to speed up and age faster.
Bata na maioria dos pontos que você mencionou, o atleta, o movimento lento, os efeitos colaterais do envelhecimento, o médico asiático (interpretado por Pat Morita) e a revelação no final de que o médico realmente não era velho, ele testou o tratamento em si primeiro.
A lição moral, ou pelo menos a narração final, foi:
For the human race life is a ceaseless competition for power, for fame, even love. But when the desire for victory is reduced to winning at any cost, then we can only guarantee our defeat.