Worth remembering nobody in the UK under the age of 25 has ever had a say in
Brexit. The next election will be the first in which Millennials outnumber Boomers, which could see the dynamic change quite quickly.
And if they want to be in the future they can be asked if they want to change their minds. Democracy doesn't stop just because you get one result you like, democracies allow their citizens if they want to change their minds.