The Memory expert explained my recent memory lapses as follows: The brain is like a Giant hard drive, a Terabyte, and when we are young there are few things stored there so the memories are quickly and accurately accessed. As more and more information and memories are accumulated it gets progressively harder and takes longer to access them. When we get old there are billions of files to sort thru, and some of them are slow or even lost, so it takes a while to retrieve them.

Relief! Finally its explained in a simple way I can understand!