I envy people who can write messages in their Christmas cards. At first I couldn't remember to send Christmas cards that would arrive before Christmas and blessed the ones who sent cards that arrived right after Thanksgiving. It reminded me to get started.
Then one year I got out my Christmas list and found all my cards from the year before, messages written, addressed, and stamped! I opened one to see if there was any way I could just send them on...no, the messages messed that plan up.
So since then, I don't write messages just in case I forget to mail them. I don't think this is Alzheimer's. I think it just long-term stupidity.