Frontotemporal dementia tends to start at younger ages Frontotemporal dementia is the 5th most common cause of dementia. It’s also referred to as FTD or frontal lobe dementia. It’s estimated that there are 50,000 to 60,000 people living with FTD in the United States.  It often occurs between the ages of 45 and 65, but can also start as early as age 20…