(Although it raises as many questions as it addresses, and I think the comment on Remainers being motivated to vote may miss the point, in that it seems more likely to be the case that they would have been consistent voters but rather might have just switched allegiance)
Some interesting preliminary analysis on the turnout / age debate
https://medium.com/@psurridge/britains-divide-diversity-key-to-turnout-rises-a51626d5c969
(Although it raises as many questions as it addresses, and I think the comment on Remainers being motivated to vote may miss the point, in that it seems more likely to be the case that they would have been consistent voters but rather might have just switched allegiance)