I'm going to push back here. I'm the oldest person on my team, and I see new people coming in and discounting my knowledge because it doesn't line up with the blog posts that are trending right now. But those blog posts are largely an echo chamber of people who simply don't have the experience to foresee the end game of following the popular trends. It's called experience for a reason--there is no way that someone 20 years earlier in his career than I am is going to have as many disparate facts loaded in his head as I do, or understand all the connections between them.

Also, in the software development industry, we waste a huge amount of time and money on a cycle where someone decides the current popular tools are too slow and heavy, and then they create a new tool that promises to be fast and lightweight. While it basically doesn't do anything, it _is_ small and lightweight. So everyone rushes to rewrite their product in this latest hotness, and starts demanding all the features of the older tool. Surprise! Once the new tool can do everything the old tool did, it's now heavy and slow. And so someone notices and builds a new, lightweight tool that does not much.

After you've seen this cycle play out a couple of times, you're not that quick to jump onto the latest hotness, and all your younger colleagues smirk behind your back because you're "not interested in keeping current." Meanwhile, they jump after the new shiny object and they never stick with anything long enough to develop depth of expertise.

But whatever. If you want to internalize ageism, you do you.