If you still have any McCormick Schilling spices or herbs in rectangular red and white or green and white tins...surprise! Except for Ground Black Pepper, they're over 15 years old!
Hard to believe, isn't it?
I confess that as recently as a year ago I had a green and white tin of Sweet Basil Leaves in my spice rack. I never used it because I knew it was very old, but I was sentimental as it was the very last of the old tins I had. I ended up washing it out and saving it as an "antique." :)
McCormick Schilling has a useful page on how to tell how old your spices are, linked above.