There's actually a biography of Priscilla that goes into detail about how the narrative that Priscilla and her family put forward - that Priscilla met Elvis at 14 but didn't actually start dating him until she was 17 - is false. The author went to Germany and other places and interviewed people who knew Priscilla when she was living in Germany with her parents. The relationship absolutely started when she was 14 and Elvis was 24.