My wife asked me how much money was needed for a one ounce envelope. I said, “One Forever stamp.”
She asked me what the stamp had cost. I said I didn’t know; we have many, bought at different times.
She insisted she needed to know how much money was needed and whether she needed two stamps because they were bought a while back!
So no, she certainly doesn’t know and I don’t care until we run out of old stamps.