You must have lived in Norway continuously for the past two years (if you are over the age of two) and intend to continue living here.
This means that you cannot have been abroad for more than two months per calendar year during the past two years before we make a decision in your case.
From 1 January 2020, you are not required to give up your original citizenship to become a Norwegian citizen. You can have one or more citizenships in addition to a Norwegian citizenship. However, if the country you are a citizen of now does not allow you to have more than one citizenship, you may still lose this citizenship when you become a Norwegian citizen.
You must make sure what the rules are in your current country of citizenship. You can, for example, look for information on an official website which belongs to the authorities in that country or ask an embassy.
You do not have to inform Norwegian authorities that you wish to keep your previous citizenship.