The Old Soft Person is a character from the episode "Gut Grinder" who lives in Soft Village. He is the one who tells Finn about the "gold-eating monster" known as Gut Grinder and the Soft People's propensity to pile their gold in the center of town and dance around it. When Finn asks about the Gut Grinder's appearance, the Old Soft Person explains that it terrifies them so much that they close their eyes and "go wee-wee" when it attacks.
He is various shades of green and fluffy. He appears old, having a mustache and walking with a cane. It would be difficult to discern that he is old without his cane and Finn's words, as his appearance gives away very little about his age.