Lynne
Absolutely, and they might also be more likely to pick up the fact themselves that they cannot do something they consider they should be able to, and bring it to someone's attention.
Jan commented to me on her being unable to remember some things - and this was way, way before any symptoms appeared.
Of course, I just reassured her at the time, because my memory has always been lousy with names, for instance, and I thought it might just be part of aging, for her.