The implication that someone couldn't keep up with a relatively new things-- in your case vague example something they even encountered a few years earlier-- is pretty much the definition of ageism. Anyone who decides to keep their professional skills current will do just fine whether they're 5 years out of school or 40 years out of school. If someone doesn't keep current & is 5 years out of date on their skills, there's not a lot of difference between a 30 year old and a 60 year old that are equally 5 years out of date. Though the 60 year old might have decades more of experience working in their advantage, so maybe the two aren't equal.

25 years ago, the hot technology was dial-up modems. And PCMCIA cards to connect to WiFi.

Haven’t had much use of that lately.