Kolstad, best known for his theater and cabaret work and roles as the star of productions aimed at children, died at Oslo's Diakonhjemmet hospital.
"There wasn’t any acute cause of death," said Morten Kolstad, noting that Henki Kolstad was admitted to hospital just two days ago. "He just passed away, quietly and peacefully, around 9am."
Kolstad and his wife Else had celebrated their 70th wedding anniversary on July 8 at a family estate in Holmsbu. "They were sweethearts for 76 years and married for 70, and not many people can claim that," said Morten Kolstad.
The actor made his theatrical debut at the age of 13 on the stage of Norway's National Theater in 1928, and launched his movie career just two years later.
Kolstad played roles as both a serious actor and a comedian, and was a longtime fixture on the premiere scene in Oslo. He was as lauded for his interpretations of Ibsen roles, as he was for spoofs and wild theatrics.
One of his best-known roles was as the shoemaker Jens Petrus Andersen in the holiday show "Christmas in Shoemaker Street." (Jule i Skomakergata). He was widely regarded as being among Norway's best and most versatile actors.
Kolstad's death follows that of another well-known actor, Harald Heide-Steen Jr, earlier this month.