Torstensen/Iversen/Andersen - Norway

Johanne Torstensen (Tostensdatter) was born 31 Dec 1822, Sandefjord, Vestford, Norway in 1849 at the Sandar Church, Sandefjord, she married Anders Iversen (he was a Seaman who drowned in 1869). she was last seen as Johanne Iversen on the 1910 census with her son Søren Andersen and family, word is that she died sometime around 1912 at the ripe old age of 90 (not an uncommon milestone with regards her descendents :) i'm also trying to find deaths for 3 of her 7 children (the other 4 have been accounted for in Norway, USA and New Zealand): Iver Thorvald Andersen born 22 Mar 1849, Langestrand, Larvik, Vestfold, Norway (last seen in Kristiania in 1910) Søren Andersen born 2 Mar 1852, Langestrand, Larvik, Vestfold, Norway (last seen in Larvik in 1910), we found his wife was buried in 1928 in Larvik so they were still around that neck of the woods then :) Anne Kirstine Andersen born 4 Jul 1858, Langestrand, Larvik, Vestfold, Norway (last seen in a picture taken in 1873) can anybody help me with regards to finding Johanne's (or her childrens) death/s? it would be most appreciated. cheers Richard