My first flight was when I was pretty young, maybe six or seven years old. My parents had divorced and were living in different states at the time. I would fly from Ohio to NC after the school year and back at the end of summer break. I would fly alone, I did it for a couple of years. I am pretty sure it took a little encouragement to get me to do it but everyone told me it would be fine, even fun, so I did it without much fuss. This was on prop passenger planes back in the mid 60s. Not big jets but nothing really small either, pretty big planes.
I sat in the back near the stewardess area but they let me walk around and sit wherever there was an empty seat so I checked the plane out pretty well. The pilot talked to me and even gave me a set of wings to pin on my shirt. I brought a toy or two with me to help pass the time, I even remember one of them was my etch a sketch. The stewardesses gave me any snacks I wanted and even let me pass out chewing gum to the other passengers.
So my first flight left a pretty good impression on me. I almost forgot about complaining about how bumpy one of the landings were to one of the stewardesses. She reported my complaint to the captain and it didn't happen again. He even asked me if the next landing was ok.