I don't find this post inspiring, I find it sad. It's partly self-encouragment, part PR. The fact that it even exists is proof that the author is facing some issues, no matter how confident they would like to appear. That recipe to stay current looks tiresome. Listen to two podcasts, two webcasts, subscribe to four magazines, teach courses, go to one conference per year, blog regularly, read blogs, follow the latest…
Nah. The fact that this post exists is evidence that ageism is a thing. What makes you think older people are passionate about the latest and greatest JavaScript frameworks? That is not my experience at all. New frameworks are just the same old stuff in a new wrapper. We've seen it all several times over. Like, backprop was a cool thing in the late 80s. I, too, find this post sad, but probably not for the same reason…
Indeed, ageism exists and it's a form of discrimination. There are societies (e.g. japanese, korean, central/southern european) where ageism works the other way around, at the expense of younger people.
In both cases it's still discrimination and we should acknowledge the problem and fight it instead of trying to look/act younger or older.