I like to see people post things like this, to REMIND everyone there *IS* still the OS that's been around for almost 40 years...I don't think that's an accident.
Erm.. going somewhat offtopic, but Windows isn't even 30 years old (Windows 1.0 was released in 1985). Even then, Windows 1.0 isn't really a reasonably direct ancestor to current Windows. You'd have to go to Windows NT for that, and that didn't come around until 1993. Which makes the current Windows barely 20 years old. (And I could see some arguments that you might want to move the ancestry up to Windows 2000)