I can think of very few products that have never changed their logo, but only a very few.

Clabber Girl baking powder (same picture from 1910)
Mrs. Stewart’s Laundry Blue (same picture from the 1880’s)—but who even uses laundry blue?
Morton Salt: last changed their logo in 1967, before that they updated it every 20 years or so.
Kelloggs Rice Krispies: the “3 elves” logo is different from when I remember it growing up in the ‘50’s but they could use a girl or an elf of color if they decide to update again.

Argo cornstarch removed the Native American girl head from their logo several years ago, also updated the packaging so that cornstarch didn’t spray all over every time you opened the box.