The true midpoint of life is actually... wow...mp4

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What 18 years old actually means
We generally know that if we assume a lifespan of 80 years, the midpoint of life is 40.
However, while a single day felt as long as a lifetime when we were young,
you have likely felt that as you age, each day passes as fast as a rocket.
This is because the way we perceive time is not linear (at a constant speed), but logarithmic.
If we assume the age when our first memories begin is 4 and set the average life expectancy to 81,
and then apply a logarithmic model of time perception, the calculation is as follows:

In other words, the true subjective midpoint of life is not 40, but exactly 18.
This means the time from childhood to adolescence accounts for half of the entire life as perceived by our brains.