Over the last 100 years there has been an enormous increase in the population of elderly people (age 65 years and older) in the world, although this increase is much larger in the industrialized than in the developing countries. A well-accepted observation is that with age, a decline in recall and recognition of facts and events is often observed. By the year 2050 it is estimated that 20% of the population will be 65 years old or older. With the increase of the elderly population and the high incidence of age-related neurological disorders it is expected that there will be a dramatic increase of neurological disorders in the next few decades. Degenerative brain disorders such as Alzheimer’s disease (AD), Parkinson’s disease, and other dementias will hit the elderly population more strongly in the next decades.