We can expect to be a little forgetful as we get older. But serious memory problems may signal Alzheimer's disease—a brain disorder that has serious effects on memory, thinking and reasoning, and only gets worse over time.
Possible Alzheimer's disease
If you’re concerned about changes in memory, talk to a doctor. The problem may be caused by something other than Alzheimer's, and the right care could improve or reverse it.
Sources: Alzheimer's Association; National Institute on Aging