OLAF Hansen

I am trying to get any info regarding my grandfather Olaf Hansen. He emigrated from Norway to South Africa. I found a death certificate stating he died on 11 Aug 1941 also naming Hans Tygessen as his father and Bertha Halvorsdatter as his mother. It states he was 64 years and 6 months old when he died, which will make his birthday in 1877. My father Sigurd Hansen was one of the children born out of Olaf Hansen second marriage. Any info regarding his actual birthdate and possible contacts of family in Norway would be greatly appreciated.