 A Japanese national is assumed to have renounced their nationality upon naturalization in any foreign country, or if they otherwise acquire foreign nationality by their own choice.This is not triggered by acquisition of foreign nationality that is not by the individual's own choice, such as acquisition of foreign nationality at birth, or automatic acquisition of US citizenship due to adoption or a parent's naturalization.Under the revisions made to the Nationality Law in 1985, Articles 14 and 15 require any person who holds multiple citizenship to make a "declaration of choice" between the ages of 20 and 22, in which they choose to renounce either their Japanese nationality or their foreign citizenship(s).