North Shore Farms store manager Anatoly Shashkin tweeted a photo of the coupon on Tuesday, March 19 and it went viral soon after.
He said a customer recently came into the supermarket with a coupon from 1983 to save 20 cents on Crisco oil.
The coupon from Proctor and Gamble had no expiration date, so the store decided to accept it.
Shashkin said the coupon went out to the office where it will presumably get mailed out to the manufacturer.