For a long time Alzheimer's Disease is known to affect older people but now Chinese researchers recently claimed a 19-year-old boy -- the youngest-ever patient -- was diagnosed with the disease. Faulty genes can likely make the disease more common in youngsters, doctors argued on Monday.

Alzheimer's -- the most common cause of dementia -- causes the brain to shrink and brain cells to eventually die. The disease is known to severely impact memory, thinking, and behaviour.