Amnesia can be caused by many different things and can effect different parts of the brain.
Some people do forget, such as with amnesia aphasia.
They can also forget as part of late stages of dementia, specifically alzheimer’s, which often works backwards, causing people to forget their most recent memories first (that is a very very simplified explanation). Since language and speech are one of our oldest memories, they’re usually the last to go and often people suffering from dementia die before reaching this stage.
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