The John Downey who died in Comox on 21 Feb 1966 was born in "Oct" 1896 in "British Columbia" according to the records below. He is listed in the 1901 & 1911 censuses in the Comox district, with the same info (b. Oct 1896 in BC).
-- British Columbia Death Registration Name John Thomas Downey Death Date 21 Feb 1966 Death Place Comox B C, British Columbia, Canada Gender Male Age 69y Birth Date 21 Oct 1896 Birthplace Cumberland, British Columbia Marital Status Married Spouse Evis Elizabeth Slaughter Father Paul Victor Downey Mother Mary Helen Anderton Film Number 2033800 Digital Folder Number 4479267 Image Number 1271 British Columbia Archives Film Number B13276 Registration Number 66 09 003214
-- BC Birth Registration Name John Thomas Downey Birth Date 21 Oct 1896 Birthplace Union, British Columbia, Canada Father's Name Paul Downey Mother's Name Mary Anderton Date of Registration 25 Nov 1896 Film Number 2134882 Digital Folder Number 4401566 Image Number 740 British Columbia Archives Film Number B13812 Registration Number 96-09-064130
sources: fsbeta.familysearch.org(BC vital records) automatedgenealogy.com (Canadian census records)