Bruce Willis' family announced that his condition has progressed since he had been diagnosed with aphasia, saying they now have a more specific diagnosis: frontotemporal dementia (known as FTD).

The actor is 67 years old, and doctors say most people are diagnosed with FTD in their 40s and 50s.

There are things you can do now to reduce your risk of dementia. Doctors say eating a healthy diet, being a nonsmoker and having a lot of social and cognitive engagement could potentially reduce your risk up to 40%.

Kristen Cusato, of the Connecticut Alzheimer’s Association, says experts are working to make a difference.

"Research is key, we need to find out why this is happening, to who it's happening to," said Cusato.

Willis' family believes he would agree, saying in their statement, "Bruce always believed in using his voice in the world to help others, and to raise awareness about important issues both publicly and privately. We know in our hearts that – if he could today – he would want to respond by bringing global attention and a connectedness with those who are also dealing with this debilitating disease and how it impacts so many individuals and their families."