I have no idea, and this thread about 3% on Grocery on the general Credit Card forum is not the right place to find out.

The thread about that seems to be:

Amex lifetime is really 7 years

but that's hasn't gotten new posts since March 2020. So I suggest you first read that short thread (which explains a bit more about Amex's record-keeping, etc), and if you you still have questions because of what sciconf wrote above here. you can quote what sciconf wrote above here in a new post in that thread, if you're interested in following this question up further.