The 1871 census entry has them both b. Ballaugh, and the ages 70 and 65 look as though they have been rounded. William could have been bapt 11 Dec. 1803 Ballaugh, son of John QUAYLE & Esther CLARK. You could check this and William's age on other censuses.

Philip Quayle and Isabella Kirmeen didn't marry until 1 Feb. 1806 in Maughold where their known children were baptised.

Sue