Why does time seem to go by faster when you're older?

I remember when I was 9 in 2011, it felt like forever by the time 2013 came around. Yet, I remember when my high school closed due to the pandemic in March 2020, and it's already been over two years and now I'm in college. Felt like yesterday. Where did the time go?
Why does time seem to go by faster when you're older?
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