Help needed confirming ancestry

Recently I have begun tracing the ancestry of me and my family and I have managed to track my ancestor back to Flosta, Aust-Agder. Atleast I think that I have, i'm about 90% sure. https://www.digitalarkivet.no/en/census/person/pf01038160003718 In The Netherlands I found a preserved wedding document and the parents are listed as: "Ole Terjesen" and "Anne Kirstine Johannesdochter" The latter is Dutch spelling however so it should be "Johannesdatter" The problem there is that Johannes doesn't seem to be a common name and I believe the correct Norwegian spelling should therefor be "Johansdatter" If the above is true then the only difference between the name of the woman is that her last name is "Johnsdatter" not "Johansdatter" and that her second name is absent. One might say well, if those names are close enough and the name of your ancestor matches, that should be fine. The problem is that my ancestor left Norway in the 50's 60's and came to The Netherlands, he married in 1860. The censuses in Norway were numerical in the decades before that, the earliest exception being 1815 I believe. The reason that I believe that this is his family however is that the parents are old enough, both the sons also share the same profession. On the Dutch wedding document the parents are listed as living somewhere that I read as "Braarvik" or "Braasvik" And it happens to be that this family lives in the district of "Braarvig" Flougstad (Flosta) which is almost identical, i've checked all the other residents of this district in 1865 so to me it feels as if this has to be a match. I have already assumed this to be true and i've done some more digging. I found a 1815 census of Flosta and on page 20 there is a family with a son named Ole Terjesen. The problem is that on the link above he is 61 which means that in 1815 he should have been 11. On the census of 1815 he is listed as 9 years old. https://media.digitalarkivet.no/view/51211/20 I cannot read Norwegian so it's rather difficult for me to search through things, especially in these scanned documents. I can only make out the names and ages but not other things that are written. I would be very grateful if someone could help me out. I also think I found one of the sons of Ole Terjesen. https://www.digitalarkivet.no/en/census/person/pf01036551000971 Problem is that he should be a year older then he is listed on that link, which is discouraging. That's about all I think, the name of my ancestor is "Terje Andreas Olsen" but he isn't listed anywhere with the exception of a church record that confirms his birth date at the 25th of May 1831 and him being baptised on the 26th of June 1831. He lists himself as having been born in "Flougstad Norway" on Dutch documentation. He used to be a sailor or "Matros" in Norwegian. My assumption is that he met a woman in The Netherlands, fell in love, married her and moved here. That's speculation though, all I know for sure is that he married her in 1860 in The Netherlands and raised a family in The Netherlands.