Dementia is a neurodegenerative disorder affecting mostly cognitive functions including memories, decision-making ability, and other normal functions. Dementia can be caused by various factors including genetic susceptibility and age, age being the most common. Genetic susceptibility usually involves multiple genes exerting subtle influences rather than a single mutation. Some genes have been identified by scientists that are associated with early onset of Alzheimer’s disease leading to dementia under 60 years of age.