I think your memory might be failing on this, because we’re about the same age and autosave wasn’t really a common feature in the 90s. MacOS didn’t introduce autosave until OSX Lion in 2010, and Microsoft’s auto-recover (which was their only feature even close to autosave until office365) wasn’t introduced until the 2000s and didn’t work properly until 2007.
It happens to me more and more these days as well.