Getting DUMB

I have noticed lately that I can't remember things as well as I once did. I have trouble with words that I use infrequently, and I speak slower to give my brain more time to catch up to my thoughts. I also notice that it takes me longer to process information. For example, I was playing Monopoly last week, and had to stare at the dice to count the dots before I could get the total. Last week I had to send an e-mail to someone and couldn't remember how to spell "assessment", "Wednesday" or "outlining". This bugs me, because I have always prided myself on being an excellent speller.