Could you recite the alphabet backwards?

The friend of a family member recently went to a neurologist for testing, because she’s experiencing memory loss. Among the tests the neurologist gave her, one was to recite the alphabet backwards.

In discussing it with my family, we were saying we would have trouble reciting the alphabet backwards. I would probably have to do it forwards in parts in my head and then backwards, like “xyz, zyx.”

I am not asking because I doubt his diagnosis, because obviously the neurologist did a bettery of tests and this was the conclusion. I know his diagnosis is based on more than just this test, and she is experiencing issues that are obvious to us all. I’m just asking about how easy or difficult it would be to recite the alphabet backwards. For me, not too easy.