He waited to marry her until several days after her birthday so she would be 20 years old when they got married and she became Diana, Princess of Wales
The Bonny Prince Charles, most eligible bachelor in the world at the time, started dating Diana Spencer when she was 17 and he was 30.
This is a good meme to put out there in defense of Judge Moore.
It shows that a 30 year old dating a not adult teen as acceptable, even lauded, by the entire world.
Remember the cult of personality around Princess Diana?