Really, you wonder???
It's how we all learned to ride - and fall too, mistakes made were learned from!
However, we all 'learned' in a rather safe(ish, OK) environment compared to the "125cc minimum (if not a 150!)" bikes of now, which all do around 100kph or more even: get off at that speed and luck must be with you!
We did stupid things, showed off to the poppies and partied etc, but all on a modest - hence somewhat safe - bike, I'm sure this actually has contributed to us being here now!
Government is stupid to have increased the minimum to 125cc, this is costs lives AND makes parents wary to allow their offspring on them, with the result that fewer young 'bikers' are seen on the road, and suffice to say that those who buy new real bikes are older if not grey!