Before knowing what the difference between Dementia and Alzheimer’s is, you should know these terms separately. For instance, people replace Dementia and Alzheimer’s with each other, but Alzheimer’s is a disease that comes under the umbrella term of dementia. There are many types of dementia. Therefore, it is a much broader term with multiple symptoms affecting the brain cells, like communication, behavior, intellectual thinking, and mood changes. According to recent studies in the U.S. estimated 6.5 million the age 65 and older have Alzheimer’s, including 73% are 75 or older. Whereas about 3% of adults ages 70 to 74 had dementia.