I don't think age makes people conservative, I think power makes people conservative. If you accumulate wealth and power then you may become conservative in order to protect your wealth from taxes.
Just as others in this thread have said, it's the "fuck you, I got mine" attitude.
I've never banned anybody for saying their view, and I don't think I'd support someone being banned for saying their view, as long as they're being respectful, and as long as they're not advocating anything criminal.
Personally I would like to be able to talk to people with different views, in a civil manner. But Lemmy.ml doesn't seem to want that. If you post something that they don't like (even if it's a very moderate view and is expressed in a completely civil way) then they ban you. They seem to really hate moderate people.