“They’re designed to copy human beings in every way except their emotions. The designers reckoned that after a few years, they might develop their own emotional responses: hate, love, fear, anger, envy. So they built in a fail-safe device.” (Police chief)
“Which is what?” (Deckard)
“Four year life span.” (Police chief)
Four years is a long time. In Blade Runner, it was the entire lifetime for Replicants. Four years is an entire high school experience. Think about the different person you became between freshman and senior years; between entering and exiting college. What about how different you felt physically four years ago? How about the differences between when you were 20 and 24? 28? 32? The difference in physical ability and experience can feel like nearly a lifetime, and the difference between when you were clueless and when you knew better can make you a different person.
That interval drives competitive tension in the Olympics, continuously pitting rookies against the veterans, the ones who have had to wait that four year lifetime to return. The phenoms may not yet have a target on their backs and may not have the pressure of a Sports Illustrated cover to live up to or the hopes of a nation, but they also may not know how to handle the normal butterflies of competition on this biggest world stage. Rookie nerves play into the misjudgment and errors can occur in that closing killer minute when the veteran zooms past in the bike race, leans forward to touch the wall first, or feints right and goes left to score.