I believe he is 12 because he certainly isn't a "littlun" but is a "biggun" which is about 10-12 years of age or something similar to that.
Ralph, the Protagonist of Lord of the Flies, is 12 years old. According to the book Ralph is described as being "twelve and a few months."
Ralph is made chief in Chapter 1 of "Lord of the Flies" by William Golding.
Ralph
Jack and Ralph.
penis
ralph
Ralph
meat
Eric
Ralph
he moves
Ralph