Loss of citizenship because of non-residence - Retention of Citizenship
02/03/2008 :: A Norwegian national who acquired Norwegian nationality at birth, but who has not resided in Norway for a total of two years or in Norway or other Nordic countries for a total of seven years, shall lose his or her Norwegian nationality upon reaching the age of 22. This does not apply to a person who will become stateless as a result of the loss. A person with sufficient connection to Norway may, however, apply for retention of his/her Norwegian citizenship. Such application must be submitted in time before the the applicants reaches the age of 22 years.
Please note that only periods of +6 months at a time can be taken into account as residency. This also applies to persons who are born in Norway. + More