When Oline Christensen was born on 15 October 1875, in Hjørring, Denmark, her father, Niels Christian Christensen, was 34 and her mother, Marie Egholen Nielsen, was 31. She married Kristian Ludvig Ingvardsen on 18 December 1896, in Hallund, Dronninglund, Hjørring, Denmark. They were the parents of at least 5 sons and 6 daughters. She lived in Øster Brønderslev, Børglum, Hjørring, Denmark for about 10 years and Hallund, Dronninglund, Hjørring, Denmark in 1925. She died on 12 July 1954, at the age of 78.