Taco Truck
60% (Local class): 22:45
70% (Regional class): 19:30
80% (National class): 17:04
90% (World class): 15:10
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Are you kidding me with this? Age grading does not work because 99% of the fast people already retired by that age. And even if they're competing, they are training not even 50% of the what they are capable of because it no longer matters.
I would though add that 18 minutes would be respectable.