I don't think he is advocating for ageism. He is merely making an observation, which is absolutely true in most companies. You are more likely to get away with

I don't think he is advocating for ageism. He is merely making an observation, which is absolutely true in most companies. You are more likely to get away with overworking and mistreating a youngster than someone with more life experience (who may also have other options and/or savings which gives them the ability to quit), so from an employer's perspective it's a no-brainer (just don't put it in writing, or handwave it as "culture fit" or similar BS). There are of course some companies who value and capitalize on the experience of older people and have good work-life balance... just don't expect that in your average JS/blockchain/AI shop which is all tech seems to be currently.