I think that it is very safe to say that he would have seized his opportunity to stardom at a time like that. The public was reeling from Voldemort and stories of a “Hero” that swooped in and saved innocent people would have been very popular. In fact, because they wanted so badly to believe there was someone in the world that could rival the evil they had witnessed they may not have stopped to wonder if it could be true that one man did all that. Perhaps as time went on he became more of a symbol for what they wanted/needed and that is why so many failed to realise he couldn’t do what he claimed he had done.
We don't know his birthdate (that I could find anyway.) So I think it holds water.