Alzheimer’s disease affects more than 30 million people worldwide, mostly the elderly. After the age of 65, the chance of developing it doubles every five years. By 85, the odds are one in three.
Its symptoms, which include memory loss, difficulty with basic tasks and depression, progressively worsen. As global life expectancy rises, so will cases of Alzheimer’s, making it one of the big public health challenges of an ageing world.
