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.
Take care of any chronic health conditions that you have in order to help with improving your memory. When you do not feel well, you can become depressed. A depressed state of mind adversely affects how your brain retains information because your brain will not be able to focus. So, taking care of your physical health is important in improving your memory.
Try to control the amount of stress in your daily life. Stress is one of the worst enemies for your brain. It destroys brain cells over time and hurts its ability to create new memories and retrieve old ones. Meditation is one of the ways that you can use to reduce the amount of stress in your life.