If you ever go to Japan save up some good money for collectibles. They’re sold at VERY reasonable prices and because it’s Japan and people take care of their shit they’re in very good conditions a lot of the time. You’ll want to buy a lot of your childhood stuff, I know I did. I had to buy an extra checked luggage just for all the stuff I brought back and I only traveled with my carry on because I wasn’t expecting to buy anything except for a game cube which I could fit. Turns out I was wrong.
Probably because people have been using it since the 90s for either gender. Same with dude. I was in high school over a decade ago but back then I remember dude and guys being gender neutral, both guys and girls used it that way. Funnily enough this same conversation was happening back then too among my peers, and we all agreed it was already gender neutral at the time.