Why does time seem to pass by faster as we get older?

I remember just 9 months ago, Betty White passed away, and now Queen Elizabeth's passed away. These 9 months flew by in a blink of an eye. I'm 20 now, and I remember when I was 11, it felt like forever waiting 9 months from the beginning to the end of the school year.

Why does time seem to pass by faster as we get older?
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