ditto, one thing you also might want to try out to prevent cognitive decline and increase your memory and ability is
Welcome to BrainBuilder.com - Train Your Brain! as it uses digit span exercises. These will help to develop your raw memory power. brain trainer has a couple memory exercises but they are working memory and immediate memory. Using both together is the best way to go about it. They're really quite beneficial but I just have a lot more trouble staying with it because it doesn't have the variety and it seems more like work than play for me. If you can stick with it you'll have amazing results, however. Digit span is very closely related to high intelligences and very high academic marks. I used it for a while, and will likely start using it again in the relative future. The more ways you feed your brain the better. Board games, strategy games, playing with friends, maths, schooling, puzzles and exercises like these will all make a positive difference.
One thing I find that helps me is to memorize little things regularly. Something I'm going to do soon is memorize a quote or scripture every single day. Zig Ziglar memorizes a new word with the definition and a new scripture every day and does this in about 6 minutes. He's had a lot of practice, but it goes to show that the practice pays off. Many memory champions started out with average memories and just practiced using their memories and developed better techniques for remembering. All memorization uses a technique whether we know it or not so if you develop better techniques you will be able to memorize things better.
-Dynamis