Give examples of myths about aging that many people believe. Why are these myths harmful?

People say that you get Dementia/Alzheimer's as you get older, and many people blame it on aging. Although older people have a higher risk of getting Dementia, the levels of ACh and glutamate in our neurons is what affects the probability of getting Dementia in a lifetime. Less ACh and glutamate will lead to higher risk of Dementia. Aging is less considered. We must remember that correlation does not imply causation.