[Zeke]

At one time I didn't even need a personal phone book (contacts these days). However, that diminishes as you reach old age. However, if I call a number within a month or so, I can recall the number.

Certain functions like copying a number off the screen is tougher. I don't know why. Say it out loud to me and I can hit the number every time up to a reasonably amount of digits — maybe 10, the amount in a phone number. CC numbers are too long for me to recall unless I memorize them.