Plaisted, Sier & Young Familes of Westbury 1700s (General)
There are a number of articles on 'the net' regarding the average height through the ages.
'from Bones in Farringdon Street, London (17th century)'
Average man : (5'6 inches)
Average woman: (5' half an inch)
So Christopher was taller and fit to be a Pikeman - the pikes measured 16 feet+