|Usain Bolt and the Fastest Men in the World Since 1896 – on the Same Track|
From that article -
"To get a little more perspective, let’s see how America’s best young sprinters compare. Here are the records for American sprinters at different ages, as recorded by the Amateur Athletic Union. Obviously, they are well behind today’s athletes. But they’re not as far behind as you might expect.
America’s fastest 8-year-old ran the 100-meter dash in 13.46 seconds – less than a second off third place in 1896. And the record for 15- to 16-year-olds is 10.27 – good enough for a bronze as recently as 1980."