> the age group which actually travels, studies abroad, looks for new jobs which right now they can choose from all over the EU, has more international contacts than previous generations

Oh yeah, rich people stuff.

I don't know many people who've done that. I know one guy who left for the USA, I know one or two older people who go on a regular holiday out of the UK each year. 90% of my friends have been abroad once or twice, but it's not an influence on their current EU debate.