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In addition to all the things said elsewhere in this thread, younger demographics are less likely to engage with polling, which is likely effecting the outcome of the polls. The emails/texts/phone calls/etc just get ignored, so that leaves the older generations as the only ones who actually answer.
I know the polls try to take that into account, but it's never going to be possible to do so perfectly.
So tldr: fuck the polls go vote, and make sure your friends/family votes
Also worth noting that younger people are less likely to vote
That is true, however the last few elections have seen strong increases in youth voter turnout. And that makes sense given the now broadened popularity of mail in voting, the climate crisis, etc.