John Wayne's height has been recorded as being at least 6' 4". His athletic records at high school show he was 6' 3" at the age of 17, and this increased to 6' 4" by the age of 18. Online sources...
Kennedy was 6 feet and 1/2 inch tall.
john wayne was 6f 4
16 hands tall
According to http://www.astrotheme.com/heights/6%272 Patrick Wayne is 6'2" tall. Patrick Wayne the son of John Wayne is also roughly six feet tall.