There is no means a person can specifically give the exact age of Kim Jong’un’s wife. Ri Sol-ju or Lee Seol-ju was announced as the wife of Kim Jong-un and the First Lady of North Korea on July 25, 2012 by the North Korea’s state media and referred her as “his wife, Comrade Ri Sol-ju.” Very little information is known about her and some people claim that she was born between the years of 1985 and 1989.
Using this information available to the public, we can just assume that her age ranges from 27 to 32 years old. No one can say for sure if the reported years of her birth are correct, and the only thing we can do is guess until her correct birthday is announced to the public.