I'm in my 30s and have watched some of his videos - including the squid games recreation (not beast games). I like them. They're whacky and over the top but there's nothing wrong with that.
While I agree that a 13 y.o. is probably more likely to follow him than a 30 y.o., his reach is anything but limited to the teens & children segment.
Chamath Palihapitiya have have worn Mr. Beast merch on multiple occasions on the All In pod as well - which I find kinda funny :D
That there's no separation anymore. YouTube added support for multiple audio tracks and since then everything goes to one channel again. The channels in other languages even redirect to the main channel.