I am from Norway. Senior discounts are typically given from the age of 67 on public transport, museums, cinema and theaters (not all necessarily). Picture ID with birthdate is required, but you don´t have to be Norwegian or even an EU citizen to receive senior discounts. Senior discounts are often listed in Norwegian as "Honnør" or "Honnørrabatt".

Thanks for clarifying this, Malamea. When I was in Norway, I would not have qualified. Now I would :-).

Thanks to Malamea for clarifying the situation- I will find out soom enough as we fly to Copenhagen tomorrow evening. And thanks again to all who answered

Have a great trip!