HI I looked again at that controversial 1910 census. I searched this time on "Pearl Wasson" instead of Omer's name. Again, up comes Pearl St. Pierre age 33(and Omer J.) in Manchester, with additional information suggested by an Ancestry.com user, indicating she is Pearl WASSON. She is born 1877, NOT 1891.
It's important to have this confusion cleared up - as this indicates the couple was married in a different time period than you thought.