This study quantifies the risk of dementia among adults 55 years or older with mild, moderate or severe traumatic brain injury or non-traumatic brain injury trauma. 

Raquel C. Gardner, MD, of the Memory and Aging Center at the University of California, San Francisco, and colleagues, found that those with moderate to severe TBI at 55 years or older or mild TBI at 65 years or older had an increased risk of developing dementia. Younger adults may be more resilient to the effects of recent mild TBI than older adults.

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