Your John is indexed in the Vital records deaths as JOHN MASSON
Quebec, Vital and Church Records (Drouin Collection), 1621-1967 about John Masson
Name: John Masson Event: Enterrement (Burial) Burial Year: 1871 Burial Location: Huntingdon, Québec (Quebec) Place of Worship or Institution: St-Joseph
The fourteenth day of June, 1871, the undersigned Parish priest interred in the cemetery of St. Joseph of Huntingdon, the body of John Massam, husband of Agnes Hampson, deceased two days previous, aged one hundred and 10 years, of this Parish. Present Peter Brady and Patrick Solan who did not sign.
So the 1871 census says John was 100 years old and this says 110 years ?? But wife's name is correct with what you show. Too bad it does not mention parents names.
I haven't found a death for Agnes yet.
You show John and Agnes married in St. John's Cathedral, London but ancestry has their marriage shown as Liverpool
England & Wales Marriages, 1538-1940 about John Massam Name: John Massam Gender: Male Spouse's Name: Agnes Hampson Marriage Date: 2 Feb 1802 Marriage Place: Liverpool, Lancashire, England
AND familysearch.org also has this place for their marriage but the name of the Church is St. John's
Agnes Hampson England, Marriages, 1538–1973 marriage: 1802 St. Johns Church, Liverpool, England spouse: John Massam Name John Massam Birth Date Birthplace Age Spouse's Name Agnes Hampson Spouse's Birth Date Spouse's Birthplace Spouse's Age Event Date 1802 Event Place St. Johns Church, Liverpool, England Father's Name Mother's Name Spouse's Father's Name Spouse's Mother's Name Race Marital Status Previous Wife's Name Spouse's Race Spouse's Marital Status Spouse's Previous Husband's Name Indexing Project (Batch) Number M02125-4 System Origin England-VR GS Film number 1068947 Reference ID