Sean Connery, the actor known to all for playing icons from James Bond to Indy's dad, has passed away at the age of 90, and his wife has revealed the actor suffered from dementia. "He had dementia and it took its toll on him. He got his final wish to slip away without any fuss," Micheline Roquebrune told the Daily Mail. "It was no life for him. He was not able to express himself latterly…At least he died in his sleep and it was just so peaceful. I was with him all the time and he just slipped away. It was what he wanted."You might think of Alzheimer's disease as the affliction that makes you forgetful and confused, killing your spirit. But it can also kill you, period.Alzheimer's, the most common form of dementia, is the sixth leading cause of death for adults in America per the CDC and impacts more than a million people. And unlike other diseases, such as cancer and heart disease, death rates of Alzheimer's are increasing with time. There is no cure for Alzheimer's and the memory disease is progressive. Since it involves the part of the brain that controls your thoughts, memories, and language, it can start mild and ultimately leave a person unable to carry out daily activities. That's why discovering the cause is so important. Read on to hear what's needed to save lives, and to ensure your health and the health of others, don't miss these Sure Signs You've Already Had Coronavirus.What Are the Signs You Have Dementia?"There's a lot we don't know about what causes Alzheimer's disease," admits Carolyn Fredericks, MD, a Yale Medicine neurologist who specializes in Alzheimer's disease. What we do know, she explains, is that patients with Alzheimer's suffer from a build-up of amyloid protein in the brain—and most patients also have excessive build-up of a second protein, called tau. "Both of these proteins can be toxic to brain cells."So what causes Alzheimer's disease is, in short, brain cell death.Alzheimer's symptoms usually start after the age of 60. According to Dr. Fredericks, there are many symptoms of the disease to look out for, most of them involving your memory. "All of us forget things now and then, but finding that you or a loved one is repeatedly forgetting appointments, losing important belongings like wallets or phones, struggling to keep track of the date or time of day, or repeating the same question or story over and over are red flags," Dr. Fredericks points out. Other symptoms can include difficulty finding your way, even on a familiar drive, difficulty keeping track of complex tasks that you used to manage with ease—like cooking several dishes at once for dinner, or keeping track of your bills and managing your checkbook, and becoming less interested in social activities, or more anxious or depressed.RELATED: Dr. Fauci Says You Don't Have to Do This Anymore to Avoid COVIDHow to Determine Your RiskDespite lots of research, scientists still do not know exactly what causes Alzheimer's Disease. However, there are a number of risk factors for Alzheimer's that everyone should be aware of:Age: Most people