As you become older, your body and brain will change. Every brain changes with age, and so does mental performance. Mental deterioration is common, and it is one of the most dreaded side effects of ageing. However, cognitive deterioration is not unavoidable. There are certain things you may do to assist decrease memory deterioration and reduce your chance of acquiring Alzheimer's disease or other dementias. Here are six things that can help you keep your brain young.