Birthdays can get harder every year. Especially as you reach those dreaded milestones that end in zero. Lighten the mood this year with a pair of these hilarious Old Fart Slippers for Adults. These funny slippers release amusing farting sound effects every time you step, jump or run without an offensive smell. These slippers come in one size to fit most adults and make a great gift for your favorite Old Fart. Choose from three styles: Old Fart, 40 Year Old Fart and 50 Year Old Fart.