The men were reportedly not particularly keen on leaving the festival, so police had to escort them back to their nursing home via a taxi and a patrol auto.
Just to give you a taste of what they most likely took in, here's Sepultura with their cover of Black Sabbath's "Symptom Of The Universe".
A local police officer Merle Neufeld said: 'Both were disoriented and apathetic'.
An older visitor of the Wacken Open Air. Police reported they were "disorientated and dazed".
Police said in a press release that officers in a patrol auto spotted the men, "who were apparently intrigued with the metal festival". On the lineup for Friday's festival were the likes of American death metal stalwarts Cannibal Corpse, Finnish melodic death metallers Children of Bodom and Nightwish, Swedish death metal icons In Flames, and progressive metal supergroup SOEN.
It draws metal fans from around the world, and has been running since 1990.
Headline acts included Judas Priest, Danzig and Hatebreed.
Unfortunately, the home soon realised they were missing and alerted the police.
We don't know the names of these absolute LADs and haven't seen them but we can just imagine them rocking out with a zimmer frame covered in mud watching the likes of Red Hot Chilli Peppers.
A spokesperson for the festival did not know if the two men had bought tickets to the event.