You ask 66 people today,
About 16 will have voted to leave, 16 to remain, 11 who didn't vote but could have, and 23 didn't get to vote because they were too young or aren't British citizens (even if they've lived here for 20 years and have British kids)
(based on 1 million births and deaths a year, with about 2:1 ratio of people dying voting leave (in line with surveys that the older you were the more likely you were to vote and the more likely you were to vote leave)
So about 24% would have voted to leave, 24% to remain, 17% didn't vote, 5% who can now vote but couldn't, and and 30% who still can't vote.
The problem is that only the views of the 24% that voted to leave, and arguably the 41% that voted leave or didn't vote, seem to matter.