1871 is written in the birth register, but this is too close to his sibling Charles. The adjacent entries in the birth register are 1872, so it was probably an error on the part of the recorder.
Sources
"Ontario Births, 1869-1912," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:FM3J-SP6 : 8 August 2017), Elizabeth Cockburn in entry for Carelton Stanley Abell, 06 Jan 1871; citing Birth, Hamilton, Wentworth, Ontario, Canada, citing Archives of Ontario, Toronto; FHL microfilm 1,844,891.
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