It will be interesting to see if that new generation stick to their current political beliefs in 10 or 20 years.
The older generation who were most heavily in favour of Brexit were the same younger generation who voted for the EU's predecessor at the previous referendum a few decades earlier. A person's political views can change over time. And of course so can both the UK and the EU.
On the other hand the traditional patterns of individual political evolution and voting behaviour in British politics haven't really held recently and no-one seems to know why yet. So we shouldn't assume that younger voters who skew pro-EU at present will turn into older voters who skew the other way in a decade or two.
As an example GDPR is great for protecting privacy, but makes data mining for businesses really hard. Great for people, but on the long term these protections can weaken the economy which makes EU more and more vulnerable to outside control.
At the same time it's not a new thing: it's happening gradually over the last few hundreds of years.
Also in US people are fat and die much sooner than Western-Europeans (health is the most important thing a country can provide in my opinion).
With AI coming tech is really taking over from oil in importance (especially long term), so I'm not that worried about it as much as the incompetency and mismanaged EU money that should just go to the venture funds instead of how its distributed.
In 10 or 20 years when most of the leave voters die out and a new generation of politicians grows up it's completely possible for UK to re-join the EU.