I've certainly heard people toss around the myth of "expiring expertise", but even the people who believe that talk on the scale of decades. I honestly have no idea where Friend got "less than three", it's not a claim even the most ignorant ageists seem to make.

Sure, there are frameworks that turn over in <3 year timeframes, but even utterly reckless JS cowboys don't pretend experience in an old framework is worthless.

I suppose I shouldn't be surprised, though, because the article also offers: "With the advent of the cloud and off-the-shelf A.P.I.s—the building blocks of sites and apps—all you really need to launch a startup is a bold idea." It feels like the only skill acknowledged in the entire article is putting a basic JS frontend on a website.