Doctors who specialize in the aging brain say that dementia is not inevitable . Making positive lifestyle changes earlier in life can lessen your chances , they say . Alzheimer 's is perhaps the best known and most feared form of dementia . It affects about one person out of every four Americans over age 65.
Doctors who specialize in the aging brain say that dementia is not inevitable . Making positive lifestyle changes earlier in life can lessen your chances , they say . Alzheimer 's is perhaps the best known and most feared form of dementia . Even moderate exercise can actually increase the size of the brain 's hippocampus .