Stages of Dementia

Early dementia 

In this stage, a person may have problems with:

• Managing medicines, finances, and driving
• Memory
• Poor judgment
• Mood changes

Middle stage of dementia

As the disease gets worse, a person may have:

• Difficulty walking and doing daily activities
• More serious memory loss
• A tendency to get lost, repeat questions or statements, or become agitated, aggressive, or depressed
• Anxiety and wandering

People in this stage may no longer be able to live safely at home.

Severe dementia 

• Severe problems with self-care, including dressing, bathing, and eventually eating
• Difficulty speaking or recognizing loved ones

Most people live four to eight years after being diagnosed with dementia. Some people may live up to 20 years with the condition.

A sudden decline in thinking or behavior that happens within hours or a few days may be a medical emergency. It could be caused by delirium or another serious health problem.

Contact your healthcare provider right away.

Last Reviewed and Updated: August 2026
By: AGS/HiAF Public Education Committee, HealthinAging.org Content Reviewers