At the same time though the industry has an age distribution that reflects the arc of the industry more than the selection of the workers. I entered the field

At the same time though the industry has an age distribution that reflects the arc of the industry more than the selection of the workers. I entered the field in the mid-90s and saw the industry hugely explode at the end of that decade. So as all of those nascent developers look around they noticed how few older developers there were and said "boy, this really is a young person's profession!". I remember all of the "before you turn 30, get a plan B" articles then, everyone fearfully looking into management or dubious project management paths. And as that cadre aged, of course most new workers are younger, so proportionally they drop from a majority to a minority, but there are a massive number of very gainfully employed, successful older developers, and it certainly has been normalized far more than then.