When you’re young, your brain takes in every moment, so time is experienced in its fullest, it’s why that 45 minute class period seems to take forever.
But when you are older, your brain does a better job of discarding “useless” stretches of time/memory, which compresses what you feel as time passing. You only really remember the important stuff and discard the rest.
this is just my opinion, but time seems to go by faster as you age because you’re comparing it to your whole life. A baby who has been alive for 8 hours literally feels the next 8 hours like an eternity since after the 8 hours, 8 hours would be half of its lifetime, this would explain why most kids are so impatient (or at least me)
Adding on to what people already said regarding percentages of your lifetime.
Have you ever taken a new path with your car and then, the more often you drive there, the shorter it seems to take?
This is for the very same reason. When things are new to our brain, it’s busy processing all those new informations. This makes it feel like time is passing by slower.
Veritasium has made an interesting (https://youtu.be/aIx2N-viNwY) on it a few years back which I would highly recommend checking out.
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