Joseph's amazing memory: Jessica's age

A few weeks ago Jessica Pillman came to our house to visit (I was at work). Jessica asked Anna how old she was and Anna said 4, and then Jessica asked Joseph how old he was, and he said, "2, and Anna is 4, and you are going to be 25!" Our best guess is that he heard her age when we read the Pillman's Christmas at least a week before that. The things they say sure surprise us sometimes!