It may seem inevitable that one loses mental function as one ages. In fact, it may not be a feeling, it may actually be unavoidable. However, the degree to which one loses mental function need not be particularly severe. In fact, except in the case of a few degenerative diseases, research is indicating that following a few simple tips can keep you sharp as you age. And as it happens, these tips are pretty much good advice for anyone, so follow them and keep your cognitive function up throughout your life.