@gordiescotland
Unless UKIP has fallen back since May, I think we can say 4 million votes are secure for leave, which is 8-9% of the electorate (45m quoted this morning) and most of us would imagine an uncertainty zone of about 10% so I think it could be a close finish, either way.
On the assumption that the young outnumber the old (depends where you draw the dividing line, heh) and some of the older voters may be voting with their grandkids in mind, I think it might go with Remain.
I like being proven wrong though ;-)