I do have the marriage record for Margaret Ann Gauthier and William Larocque in 1897 in Russell. In that record, she is listed as 19 years old. It is not inconceivable that this record is incorrect and she could have been 29 years old. She indicates that she was born in Russell and her parents were Francis Gauthier and Sophie Hemter/Hunter. I am not sure that this information is correct either, as on her death record, her husband stated that her mother was in fact Margaret Ann Gauthier.
I may be looking at a different record than you as I seem to be pulling out only Quebec records so far -