It is, in my opinion, unacceptable to make assumptions about whole groups of people - and to suggest that over 65s should not be allowed to vote is just plain silly.
I do feel that a lot of younger people are very upset about the outcome., although certainly not all were remainers. My son and his partner were and most of my friends, but my daughter didn't vote because she was not convinced by the debates on either side and thought, whatever the outcome, the balance would always be tipped in favour of mega rich individuals and corporations.
I think it should be borne in mind that many young people who had the right to vote in the referendum did not do so. Perhaps it was because they felt distanced from the whole political process. Alternatively, having known nothing but the EU themselves, they believed it was a foregone conclusion because most people would vote to keep the status quo. Older people had a different, more nationalistic, perspective and, some might say, looked back on the past with rose tinted glasses.
I do find the situation now very depressing. Opinions are becoming even more polarised and there seems to be little room for trying to see different points of view and reaching some form of compromise.