And according to the police, they were none too happy to be found - so much so that a patrol auto had to accompany a taxi sent by the nursing home to make sure they returned.
We don't who these old dudes are, but if they ever want to come to Riot Fest, we'll put them on the guest list.More news: How to use the new app switcher in Android Pie
An unnamed police spokesperson said the men were "disoriented and dazed".
Festival organizers didn't specifically address the senior daredevils, but their official Twitter account made sure give a shoutout to elderly fans "because you're never too old too rock". This year's event, which sold out, featured headline acts Danzig, Judas Priest, Hatebreed and In Flames.
Although mud is usually an issue with outdoor festivals, Deutsche Welle reports that a heatwave caused concern for fire and dust risks.
Police praised revelers for decent behavior with little interference needed in relation with minor drug seizures.