Because your brain compares times in terms of how much time it has been alive, a day as a kid seems like an eternity because you really only have less than 10 years to compare it to, so it looks ‘bigger’ for your brain.
When you are an adult days start to be a less significant part of your entire life and your perception of time speeds up.
Work over free time. When you are younger, everything you do is new. When you start working, your job is always the same (at least this is true for most jobs). Over time, all your memories will mix up and sometimes you won’t be able to tell if something happened 10 or 20 years before, because the place was the same and people was the same as well.
I think of it in a purely mathematical way.
When you are 1 year old, the next year will add another 100% to your age.
When you are 100 years old, the next year will add a meagre 1% to your age.
So as you age, each second/day/year are a smaller fraction of your life than any second/day/year you’ve experienced before. Thus periods of time seem less significant as you go through life.
When you’re 10 – a year is a 1/10th of your life
When you’re 25 – a year is 1/25th of your life
When you’re 50 – a year is 1/50th or your life
So the experience of a year is less and less time to your experience of your life as a whole.
It’s all perception. After 30, the years really do start to fly by and just keep getting faster and faster.
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