No he isn't.
Most were young and foolish once upon a time, and most will have probably voted in favour of the Common Market/EU. But now they have a sensible Head on their Shoulders, they have seen sense and saved our Bacon, from another 40+ years of ****
Think of the Kids
This exactly, I don't think it's fair writing off all the older leave voters just because they'll be dead soon!
They've seen the good and the bad and like you say, I think even the sternest remainers will be thankful in the years to come.