With a birthdate in 1887 the one Carol M gave you aged 23 is the most likely entry, but there was also a John Kinvig b.Castletown who gave a slightly older age in the 1911 census:

Name Relation Condition/Yrs married Se x Age Birth Year Occupation Where Born
KINVIG, John Head M 26 1885 Fisherman Isle of Man Castletown
KINVIG, Eileen Wife Married 7 years F 30 1881 Coachford Co Cork Ireland Res
KINVIG, Dorris Daughter F 5 1906 Lancashire Liverpool Res
KINVIG, Norman Son M 4 1907 Isle of Man Castletown

RG number:RG14 Piece:34653
Registration District:Isle of Man Parish:Malew

Address:
3 the Quay Castletown Isle of Man

Sue