I was a touch too old for those but my regular old bicycle provided plenty of thrills and possible death and mayhem. I still bike (a LOT! 12,373kms in 2024!) but have learned restraint. When going downhill I chicken out at around 35 kph. One of my biking buddies took a tumble this fall and cracked his hip. I'm still taking him out twice a week for groceries and he's still using a cane. We heal a lot slower as we age.
They where building an overpass not far from our subdivision when I was a kid and we used to scream down the sides on weekends when there where no workers there. I'm still flabbergasted that none us got killed or badly busted. It was just blind stupid luck. No one wore helmets back then either.