As Oui and TBG point out, the demographic argument is no clincher. The 65+ cohort do die out, but are replaced by new over 65s with the same set of prejudices. Young people want to change the world, old people have stuff to hang on to, and scare easy.

We may have been right back in the day: don't trust anyone over thirty.

I used to be afew. I'm still not many.