Unless older people's votes get counted twice, how does the young have less weight for voting?

As an outsider, the news that got to me was that older people simply showed up to vote (and others didn't).

I'm thinking of the fact that there's far more 'older' people, young people are less likely to vote & young people also captures people below the voting age.

As you get older you get more politically active. I'm guessing the retired have more time on their hands.

The young just aren't too bothered. Have a feeling, with Brexit, the biggest losers are the young and I hope that there is at least some semblance that they can do something about it this time.

Voting probability is lower.

There are more older people in total.