Charles was 32 when he married 20-year-old Diana, I wouldn’t call that particularly young. Diana also noted that Charles once commented on her bulimia by telling her at the dining table, “I don’t Know why you’re bothering, it’s all going to come back up again anyway”. I think you give Prince Charles and the Royal family too much credit for the effort they would have gone to to support Diana, in fact over 25 years later they have still not learned how to reach out if you believe the account that Megan Markle gave of her attempts to find help.