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While Astro Boy is known as on of the worldwide famous anime, it is not the oldest one there is. You could read about it here.
You had me freaking reading that article for about an hour. Man was all that interesting. I started with Astro Boy, and ended up with the controversy of Kimba the White Lion (or something) and The Lion King. That was oddly similar. I believe it was a stolen idea!
No, I think Astro boy is not only first anime ever to my knowledge.
It might be the other thing with the giant robot I forgot what it was called I think it started with a G not Gundam.........