premise: Mark Arm (born Mark Thomas McLaughlin, February 21, 1962) is the vocalist for the grunge band Mudhoney. His former group, Green River, is one of the first grunge bands, along with Malfunkshun, Soundgarden, Skin Yard, the U-Men, and others. He is also the manager of the Sub Pop warehouse and previously worked at Fantagraphics Books.
hypothesis: The vocalist for the band Mudhoney would  qualify for a senior citizen discount at IHOP at the time of this writing.
reason: The vocalist for Mudhoney is fifty seven years old at this writing, that is above fifty five years old and makes him eligible for senior citizen discounts due to his advanced age. The AI does not know when a senior citizen discount goes into effect for a person.