The decline of short-term memory or forgetfulness is one of the most popular topics for jokes about aging. Here’s a sample: An elderly couple is sitting in a self-service restaurant. He gallantly asks her, "What can I get you, dear?" She replies, "I would like a milk coffee. Should I write it down for you?" He says, "Oh no, I can remember that." She continues, "But I would also like a piece of chocolate cake with that. Should I write it down for you?" He insists, "No, no, I can definitely remember that." She adds, "But you know, I would also like some whipped cream on the cake. Should I write it down after all?" He responds, "What are you thinking? I can still keep that in my head." A while passes; then the man returns with a tray. On the plate are fried potatoes and a sausage. She (with gentle reproach): "But dear, now you have...