alt Hacker NewsI think I'm mostly of the opinion these days that there is no such thing as an "outdated technology". There are technologies that are no longer fit for purpose but that is almost never because of their age. It nearly always because of one of as examples: Needing to run in an environment it can't support, Having bugs that are not getting fixed/no longer maintained, Missing features necessary to solve new problems or add new features, Hitting scale limits.
Outdated may sometimes be a euphemism for one of the above but usually when I see it in a discussion it just means "old" or "out of fashion" instead.
I'd also add "there are almost no developers using it on the job market" to the list why some technologies are no longer fit for purpose. It's a major one. Sort of tied to the ecosystem (no devs - not many things get mantained/created).