Colin Russell EWING -
Birth
1894 #27283, reg at Penrith NSW
Colin EWING
Birth Date: 1894
Father's Name: Thomas T Ewing
Mother's Name: Margaret R
Marriage
1921 #5303, reg Sydney NSW
Colin R Ewing, Olga L Russell
ERs
1930 Colin (accountant) , Olga Lilian (hd)14 Bulkara Rd, Woollahra
1936, 1937 Both at 51 Captain Pipers Rd, Vaucluse
1943 Olga at Warrington, Edgecliffe sq, Edgecliffe
1949 Olga at 5 Holt St, Edgecliffe - no-one else of same surname
1949, 1954 Colin (farmer) Old Northern Rd, Dural - no-one else of that surname at that address.
1958 Olga at 152 Ocean St, Paddington - this is the last one using her two forenames. There are more with just "Olga Ewing" which are in the western suburbs f Sydney and go from 1943-1980 so I am inclined to think they are a different person.
So it would seem that Olga and Colin separated by about 1949.
Judith