I recommend reading The Life and Times of Scrooge McDuck, which, while not officially considered cannon, is the origin story that is most accepted by fans. It tells the story of how Scrooge got corrupted by greed, resorting to horrible acts for profit (he actually burned an African village, and blew up a historical monument right in front of Theodore Roosevelt), them turned around at the end of his life when he realises his real wealth is his family.

There is also that one page that subtly confirms he isn’t a virgin.