According to his attestation papers dated March 22, 1916 at Toronto, Percy Victor Coulton of Stanley Avenue, Mimico was born on August 1, 1901 in Mimico. He listed his mother Elizabeth Jane Coulton, Stanley Avenue, Mimico as his next of kin. He was a student and had no previous military experience. He was 17 years of age and stood 5 feet 2 inches tall. He had blue eyes, light hair and a fair complexion. He was a member of the Church of England.
His brother Jowett also enlisted but was killed.
According to the 1911 census he was the son of Jowett and Elizabeth Jane Coulton. His parents has emigrated to Canada from England in 1900.
In the 1921 Toronto City directory he is listed as a clerk living with his father Jowett Coulton above their General Store on the north side of the Lake Shore Road, Mimico.