I started reading all of the answers to this questioned and wanted to add my 2 cents.
I have been using the same bottle since 1996(French’s).
I too had heard that it never goes bad and only improves with age.
As far as I’m concered the truth is that I haven’t died yet and it has always performed wonderfully for me.
I’m not one to use it often.
The taste is what it should be even after all of these years. It’s like a fine wine improving with age.