Hi James, I don't know my Peppers but if they're like most sodas then year, town etc all effect value. I think anyone is gonna need a little more than what you gave to be accurate. I do see "good for life" started about 1930 in one book but I don't know for how long. Anything before or after wouldn't so couldnt tell you which is older anyway. That's why specifics are SOOOooooo important in most cases.
Hey James, The clear one is older and was used longer. Unless they have a town or city name they are worth about 5 bucks. They both came in embossed and debossed but the value is about the same.