First time I flew alone I was 6. One of those propeller planes where you could not even stand up-right. (Incidentally, the legal age of flying unattended was 10 at the time. In one of those always-quoted-in-family-gathering moments --- after being carefully tutored by my mum --- when asked by the stewardess how old I was I said: Yesterday I was 6, but today I am 10
She still let me on though...)
As luck would have it, we hit (probably) the worst turbulence I’ve ever experienced. One guy hit the ceiling and landed on the floor next to me unconscious and bleeding from his template. I still remember the incident vividly, and it took a long time before I forgave my mum.