The term â€œdementiaâ€ refers to a group of symptoms associated with a progressive decline in brain function. There are various forms of dementia. Alzheimerâ€™s disease (AD) is the most common. The most significant risk factor for AD is advancing age. The majority of people with AD are age 65 or older. There is currently no cure for AD. However, if you notice any of these symptoms, consult a neurologist for timely treatment to improve your quality of life.