I know someone in their early 40s experiencing dementia-type symptoms (consistent with frontotemporal dementia). It is early but is quickly getting worse. It'

I know someone in their early 40s experiencing dementia-type symptoms (consistent with frontotemporal dementia). It is early but is quickly getting worse. It's heartbreaking to see how this is affecting his spouse and children. So far, they don't have a diagnosis. They are still running tests. It has to be quite frustrating not to be able to point to a root cause. So little can be known without direct access to the brain.