Everyone does. It's science.

When you are 10 a year is 10% of your entire existence. When you are 50 its 2%.

Every day is less of your life. Every day you grow and learn how to not have extreme swings in your life and grow more stable, making less "memorable" events.

When you are young you learn how not to fuck up as much. The key is to learn how to add memorable things when you're older.

Perception of the passage of time is linked to your memory. Think of it like this: If ten years passed and you have no memories at all from that time, then it's as if those ten years passed in an instant. What did you eat for breakfast two weeks ago? You can't remember because the brain doesn't record uninteresting events. There is only so much room there and it saves that storage space for noteworthy things. If you do the same thing every day without variation, like being stuck at home during pandemic, you won't have many unique memories from that time. Your perception of that time will be as if it passed very quickly. Compare that to growing up. Every stage of growing up is something new. You go to kindergarten, first grade, you go through puberty, making new friends. It's all new and noteworthy. It gets remembered.

There's science that shows that your thinking "slows" as you age, resulting in your perception of time seeing faster unless it's calibrated against something that is measuring it. Without a watch, older people's perception of a minute is longer on average than younger people's perception of a minute.

Look at your age in decades and how fast a decade passes. 20 years ago, 2 long decades, it was 2002 and to me it seems like 5 years ago. The average person lives only 7 or 8 decades. I figure I have maybe 2 decades left until I'm dead or at least utterly worthless.

Exactly the same. Time crawled on slower than an old tortoise when young, then began to speed up at around 20, exponentially so thereafter, til by the time you hit 60...the pedal is to the metal. A lot of what is called 'time' is based on consciousness, specifically its perception of time.

Speed of thought. When you compute more, time slows down. When your mind notices less, time seems faster.

I farted twice then coughed once, and 10 years went by without me even noticing.

Time is relative. Regardless of how long you live, the first 13 years will forever be the longest for you yet the first 13 years of your own child's life will have passed quickly and it will be difficult to recognize your grandchildren as being anything other than children, regardless of how old they may be.

I think it has a lot to do with new experiences and being productive. When you are older, you have grown fed up with the world and you might even be looking for an exit out of it.