There’s long-term memories and then there’s short-term memories. Eating your usual lunch is a short-term memory and will be forgotten in a week but a special lunch at a special place is a long-term memory.
We can only look back and understand passage of time from long-term memories but as we get older there are less and less novel things to do and so less and less long-term memories which is why eventually you’ve *years* that are blank in your memory. So it feels like they didn’t happen or you skipped them.
As to why, storing information is expensive – our brains have evolved to keep as much novel information as possible without repetition to enhance survival and ensure genes get passed to next generation.
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