The absolute youngest of the Brits born during WW2 would be 74. Elderly folks are more likely to get their news from (and trust) mainstream media. The mainstream British media has been scaremongering about Brexit for 3+ years. Of course, that’s going to influence the geezers’ opinions.
True. But it's the mainstream media, in the form of the Murdoch/Harmsworth/Barclay press, which have been the prime advocates of Brexit from the outset: and these dominate national newspaper sales.
Mainstream media in the UK has got the Telegraph, Sun and Daily Express as heavily LEAVE.