Some recent research has indicated that, if one practices enough, there's a chance that the brain can continue to be flexible throughout the golden years. This means that memory may not be as much of a problem if one dedicates time to the right training.
AARP.org suggests that one way to keep the mind sharp is to focus on building a type of "memory palace." This consists of envisioning familiar memories in certain locations. If one is going shopping, try to picture a dancing can of soup on the front step and toilet paper pasted over the door. The quirky image is preserved in the mind and is therefore easier to remember.
Older adults who want to better remember to take their medications may want to invest in a medical alert system. This device can be programmed to dispense pills at the right time, and will sound a medical alarm if the doses aren't taken on time.
If one is trying to remember complex numbers or phrases, try the "chunking" technique. Instead of 1,239,380, break the number into manageable chunks so that it becomes 1-239-380. The same method can be applied to letters.