The hippocampus - a structure in the brain - controls the brain's ability to learn and form memories of day-to-day facts.
But research found that the activity in the hippocampus steadily declines with age. The memory of subjects in their 50s and 60s weakened as subjects recalled events that were up to 12 years old but reached a plateau during older remembrances.
Initially, your memories stay in the hippocampus and the areas connected to the neocortex, the outer part of the cerebral cortex.
As memories age, different brain areas start to manage your memories. The frontal, temporal and parietal lobes are in charge of the oldest memories.
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