Do you forget everything? Or just your responsibilities and things you need to do?
There was a study a while ago regarding selective memory. Some people had no trouble remembering things like the date and time their favorite TV show comes on, or the name of their first crush in school, or what their favorite movie star wore to the Academy Awards, but had difficulties remembering short term responsibilities. It concluded that you basically chose to remember what you want, bar genetic and enivronmental factors leading to memory loss.
There are lots of things to improve your memory. Cut back on your digital use, including your cell phone. Seriously. How many times did you forget to do something, and you immediately call home...or someone...to make it gets done? Or what if you forgot the time you are supposed to meet a friend for lunch? You just call your friend up right at that moment, right? Same goes for finding out how to get somewhere...instead of looking on a map to write down the directions, you just go to the internet and pull up a map, or worse - you use your GPS.
I'm not preaching again digital gadgets by any means, however, if you are fully dependent on them to remember something or even use them as entertaining brain stimulation, its going to hinder your memory improvement.
Do a mind puzzle every day - crossword, word games, the Rubik's cube - something you have to figure out how to do...and no digital crosswords either!