I do think it is important how we interact with each other in this area:
It can be very discouraging to young people to feel like they are being told they are ignorant & useless by people showing up to say "well, *I've* known this for decades," as if a 20 year old should be ashamed that they are learning something for the 1st time.
But you will also see "shut up, older person. What do you know? That was then, this is now." This is now, sure, but you can learn some shit from what happened THEN.