Probable Dementia (IMAGE) Johns Hopkins Medicine Caption A new study by Johns Hopkins researchers found that of older adults with probable dementia, nearly 60 percent were either undiagnosed or unaware of their diagnosis. Credit Johns Hopkins Medicine Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.