Everyone suffers forgetfulness from time to time. But an occasional inability to remember is not Alzheimer's.
If you have memory loss, it is generally considered to be an abnormal amount of forgetfulness, according to the MedlinePlus website, from the National Institutes of Health. General symptoms of memory loss include forgetting recent events, inability to remember some events that happened in the past, or having issues remembering both new and old events.
The National Institute on Aging website states that some memory issues associated with aging include forgetting some information, misplacing objects and taking longer to learn new information.
For many people, memory loss is associated with aging and the well-known brain disease known as Alzheimer’s disease. However, one article on MyHealthBridge.com, a senior care blog, suggests that some forms of memory loss are a normal part of the aging process and shouldn’t be blown out of proportion.
https://www.empowher.com/mental-health/content/basics-memory-loss