Dementia is a Significant Problem for Those Under Age 65.
Younger onset dementia (YOD) is defined as the onset of dementia symptoms before age 65. Researchers in Sydney, Australia contacted local health professionals and hospitals to determine how many patients were classified as having YOD. Then, they compared that information with recent census data. The research team found that YOD affects 11.6 per 100,000 people ages 30-44 years and 132.9 per 100,000 people ages 45-64 years, with an overall prevalence rate of 68.2 per 100,000 people for ages 30-64.
International Psychogeriatrics, October 2014