It is generally understood that people slow down as they age, but I am trying to find out more information about why that is. Some of the research seems to indicate that one of the "confounding variables" is that, generally speaking, people don't seem to exercise as much when they're older. I was wondering if there is anyone on here who is knowledgeable about sports medicine, and particularly about the capacity for older athletes to build more fast twitch muscle fibers, to help increase speed. At this point my speed is pretty good, but I'm wondering if I can get faster, or just hope to not get any slower.

For any age, the treadmill and the elliptical will help with agility training.

As we get older, even if we continue to train, things will start to tail off on us. But, if we work hard, we can slow down that process. Typically, the older we get, the harder it will be to develop increased fast-twitch muscle, speed in general, and strength. I'm not saying that it isn't possible to do, but it just gets hard the older we get.