When Østen Andreas Østensen was born on 11 December 1862, his father, Østen Kristiansen, was 40 and his mother, Agustine Pernille Hansdatter, was 38. He married Indianne Teresia Berntine Pedersen on 18 September 1887, in Øksnes kirke, Øksnes Prestegjeld, Nordland, Norway. They were the parents of at least 1 son and 7 daughters. He died on 22 December 1951, in Øksnes, Nordland, Norway, at the age of 89.