My old Schwinn Typhoon (one-speed, coaster brake) had a speedometer that went to 50. I pegged it down a steep hill when I was about 11, and the brake was practically smoking when I finally got stopped. A few years later, I might have gone faster than that on several occasions on my Peugeot 10-speed (which I still have after 46 years), but it didn’t have a speedometer. Nobody wore helmets back then, either.
Sorry, I got distracted and didn’t realize I had posted the first time.