Motorcycle: I was in my early twenties and it was on a Norton. Did it in an automobile many times in my teens. Probably went 100mph in a field on my 490 Maico when I was in my twenties, 230 lbs. and fifty+ horsepower.
Big difference between doing the ton on an un-faired bike from the fifties or sixties, or in a car from that era and doing it on eighties and later equipment that is so powerful and aerodynamic.
On a lot of sixties bikes 100mph is close to their maximum speed, so you are going fast for a LONG time to get there. Modern bikes can do the ton in the length of a city block. The old cars with no sway bars and no disk brakes were a lot more challenging to drive than the stuff from the last few decades by far.
In high school I had a 46' Ford with flat v-8 to drive, all stock. Probably would not do 100mph, who knew with the speedo in that thing, but I took it as fast as it would go. My brother ended up rolling and totaling it out. We lived out in the country and went 100mph on dirt roads in cars that had all drum brakes and no sway bars, and we crashed them.
The brakes on old bikes and cars would often overheat and quit working altogether on the way down from their top speed.
When you get up around 100mph on a bike with no fairing and no goggles, the wind blows waves on the surface of your eyeballs and you can not see for shit, like here:
http://www.youtube.com/user/nortonshit#p/a/u/0/ggb3cz3_lzo