Of course we roamed dozens of miles from home on our bikes, something that would be impossible for my kids.
I, too, rode for miles on my bike, without a helmet of course.
Did the same on my horse. Although now after several falls and a couple of concussions I do wear a riding helmet.
The most dangerous things we kids played with were horses adn ponies. I wish I had a nickel for every fall (er, flying dismount) I went through. No helmet, and sometimes no saddle or bridle either. One old horse we made pull a toboggan with a harness made of miscellaneous straps and baler twine. He was a good sport and did not kick us to bits.