It may sound silly, but one way to improve memory is to surround yourself with good friends, and to maintain an active social life. A Harvard study suggests that those who had active and fulfilling social lives, showed rates of cognitive decline significantly lower than their less socially active peers.
Just like a muscle, with your brain it is use it or lose it. Constantly train and exercise your brain to stave off cognitive decline. Do word searches, sudoku, and crossword puzzles to keep your brain active. In this way you will surely slow down memory loss, and keep your brain's skills sharp.