Not minimizing your concern. I am 75 and run on 3 cylinders some days.
If you are aware of concern, not Alzheimers. That is what doc told me. Second, in reading re: forgetfulness, "where are my glasses," etc -- As we age, our electrical signals don't take the direct route anymore. They bounce all over the place before getting to thought formation.
My biggest frustration is forgetting a specific word I am after...now what is the word for_________, or the most descriptive word I am after. Lord, have mercy.