I knew when she was born, but math has never been my best subject! You are of course right. Princess Alexandra certainly looked older than 16. She was tall and very dignified, and she looked lovely.

It occurred to me while I was thinking about these coronets that in 1953 Prince Charles probably could have worn the coronet that Princess Margaret wore in 1937. He must have been considered too young to deal with it, and Barker says the little prince was only in the balcony for his mother's actual crowning.