Age is the biggest risk factor for dementia, meaning the longer a person lives, the more time there is for dementia to develop.
According to the Alzheimer’s Society, for people aged between 65 and 69, around two in every 100 people have dementia.
This risk then increases as a person ages, roughly doubling every five years thereafter. For those aged over 90, around 33 in every 100 people have dementia.
