XP: This thing was literally made for me!
The Great Snake: I used Windows XP until February-March 2016, starting to use it when I was 4 or 5. Before that, I had a cute little touchscreen Windows NT 4 kiosk. I had a touchscreen device before it was commonplace for kids to have touchscreen devices! (According to my parents, I had the little kiosk thing in 2006, and the iPhone, the real push in smartphones and kids with touchscreen devices, was first unveiled in 2007.)