Yep. All of the main 5 operating systems for consumers are from the late 80s and...

Yep. All of the main 5 operating systems for consumers are from the late 80s and early 90s.

- Windows 11 is Windows NT

- macOS is NeXTSTEP/OPENSTEP

- Linux is a free Unix like from the era where that was a new thing with both BSD and GNU working on it

- Android is Linux + Java (inspired by OpenStep)

- iOS/iPadOS is NeXTSTEP/OPENSTEP for phones.

(OPENSTEP is an OS. OpenStep is a framework)