what was the percentage of Americans under the age of sixteen in 1775 in the french and indians wars?

Question

I need to know what the average age was for the Americans in the French and Indian war.

Answer 1

The French and Indian War, or the Seven Years' War, did not occur in 1775. It had been over for twelve years, in fact. You're probably looking in the wrong time period or for the wrong thing.
French and Indian was the naming by the colonists of one area of the theater of the Seven Years' War.

Answer 2

~The only "Americans" during the French and Indian war, or in 1775, whichever you really mean, were the natives and they did take a census or otherwise keep such records.