Like most of your glib sort, you forget that the over 55s were the people who voted us into Europe in the first place. They have experienced more of Europe for longer than anyone else and they found it wanting. They are also the generation who can remember what life was like before the EU and if, with hindsight, they decided they rather preferred it, I'd say that represents a fairly damning judgement on the 'benefits' of EU membership to ordinary people, wouldn't you?
As for your assertion that 'we can leave if we want to', it's obvious bullshīt. We had one chance in my lifetime to leave due to an unprecedented and almost certainly never-to-be-repeated set of circumstances. Thankfully, we took it. And even then - with a clear vote in favour of leaving - our overlords (to whom you are happy to cede more and more powers, by the way) are doing everything in their power to frustrate that democratic decision.
Oh, and it's beside the point, but there's nothing 'scaremongering' about this country's immigration issue, I can assure you.