When Søren Østensen was born about 1630, in Aker, Akershus, Norway, his father, Østen Aschudtsen, was 48 and his mother, Mari Jensdatter, was 43. He married Kirsti Johannesdatter in 1663, in Akershus, Norway. They were the parents of at least 5 sons and 3 daughters. He died on 29 December 1696, in Vestre Bærum, Bærum, Akershus, Norway, at the age of 66.