To be clear I don't think television is even inherently bad for your brain. It's more about the quality of the soulless corporate content they've been spoon-fed their whole lives that has made them into dull, unimaginative people. Of course this applies to younger generations who watch TV too, but young people also have more variety in the types of entertainment they consume.

My boomer parents have practically no hobbies outside of watching TV and so it's all they do now that they're retired. And it's the worst slop imaginable, like it's either cable news or reality TV or Shark Tank or Young Sheldon. They watch a show called Supermarket Sweep, which is literally training them to shout corporate brand slogans at the TV, it's fucking deranged.

The effect of lead is greatly exaggerated. If you compare American, Chinese, and Soviet boomers - who all grew up with leaded gasoline - you'll see it's only the Americans that have brainworms. Lead is still bad, of course.