Who is the oldest of these four?
Correct answer: Prince Philip

Alfieinsanityclaws
A grand old man he is!

jsh
This question is out of date.

Mrs busybody
Alfieinsanityclaws, he wasn’t actually.

baymax
Alfieinsanityclaws, yes indeed, the grand old Duke of Edinburgh .. Prince Edward has now taken over the role, let's hope he makes a good as job of it as his dad.

DawnyC
R.I.P Prince Phillip 😢

J
Watching Phillips funeral today. 17 April 2021

Uninitialized
queen Elizabeth was born in 1533, the current queen is queen Elizabeth II

Sloane Ranger
Philip was born Prince Philip of Greece and Denmark. He disclaimed his foreign titles when he married Princess Elizabeth.
King George VI made him HRH the Duke of Edinburgh, apparently thinking this also made him a Prince (again).
He was formally made a Prince in 1957 for the avoidance of all doubt.