If you want to make it an "old vs. young" argument, then the old have collectively contributed to their country far more than the young. So they definitely have

If you want to make it an "old vs. young" argument, then the old have collectively contributed to their country far more than the young. So they definitely have a say in their country's policies. The young from the UK can still apply for a visa, like the young from many other countries not in the EU. They also have a higher chance of getting one, probably.