Aye this poll hasn’t taken into account the probability that there will be a higher youth vote than in 2015/2017. In 2017 the poll was somewhat inaccurate because of that approach:
Which could be brutal for the poll predications. There have actually been rising jumps in young voters in the past 2 elections (tremors of a youthquake lol?), and it looks set to continue here:

There is still so much hope everyone, not just for this election but for what comes after! Some boomers are saying the youth aren’t really engaged, and those that are will get bored and “move onto something else”.
They’re wrong. The newer generations are more switched on and that can’t be dismissed, nor will they get bored. They are being raised with an awareness of how difficult things are going to be for them (severe climate change, not having the benefits of being in the EU, increased gap between the rich and the poor) and that mix of resentment/concern isn’t something that fades away!
I’m sure there have been previous eras where the Tories’ under-34 vote has been nonesixtant, but Tories should be fucking terrified of this era and how it looks for their future!