I remember seeing a map that had Canada and Mexico all of a sudden. I disappointedly looked at my mom asking why she would keep such information from me. I had only seen a map of the lower 48 up to that point, so I had no idea there was more and that we were on a round planet. I don't recall what I thought when I was exposed to the rest of the world. When presented with everything about the shape of the world, I didn't doubt it.

don't remember always seen movies and shows with globes or space men looking at the world.

Age 4 I guess. What person from this century thinks the world is flat? I thought the world being round is common knowledge, today.

Great question but I have no idea. We had a set of Encyclopedia Britanica and if I asked a question like that I was often told to look it up. Since I learned to read at an early age I was able to learn a lot from it. It also had fun articles especially for children which helped.

My mother and grandparents probably told me at an early age that the earth was round if I mentioned it being flat. Since they were my authorities on everything I would have taken their word for it. They did not lie to me.

Besides I was a Superman fan and he flew around the earth so of course it was round.

I grew up in West Virginia. The word flat only applied to tires.

I've known it wasn't flat for as long as I can remember.

We had a globe it never came up.

As much flat-earthers can be both funny and frustrating, it is a reminder of a larger, dangerous phenomenon, the my opinions as good as yours school of thought. Expertise matters, and embracing ignorance is not cool. I think of it thusly:

Yes, you are entitled to your opinion. However, your opinion is not entitled to be shared, when based on ignorance or intolerance and it is not equivalent to opinion from an expert.

If you don't think it matters, 62M people voted for Trump.

Your question should be quoted the other way around. "When did I realise that there were people in this day and age who 'believe ' the earth is flat"
I guess it was when I first started watching Utube videos.

Never. Science was really a big deal in school in the 60s.
My father was a science guy. We watched all kinds of TV programs.

So, i never had an opposite view to let go. Same with religion.

I never thought the earth was flat. My dad was a high school biology/chemistry/anatomy teacher so I was taught the scientific explanations for everything growing up.

I never remember believing the earth was flat. As for gravity I have to assume it was the first time I fell down learning to walk. ?