In 2003, close to 1 in 4 caregivers of people with Alzheimer’s disease and other dementias provided 40 hours a week or more of care. 71% provided this care for more than a year, and 32% did so for 5 years or more.
Alzheimer's Association. 2007 Alzheimer’s Disease Facts and Figures. Washington, D.C.: Alzheimer’s Association; 2008. http://www.alz.org/national/documents/Report_2007FactsAndFigures.pdf