For me, it all became just a blur of days melting into one another scattered with unique events. Some were remembered, many not.

For a few years now I’ve been attempting to consciously act in a way where I remain “present” in each moment. Be they repetitive and/or monotonous or somehow unique. That, however, remains a work in progress.

I have found that having a specific mission of sorts helps when it comes to achieving being “present”. It helps to anchor memory to an objective.

My opinion is much more mathematical. The first year of your life is 100% of your experience when you turn one. The second year is only 50% of your experience. Then by the time you're fifty, each year is only 2% of your total experience at that point. They accelerate because despite what people believe, we don't have a real grip on the passage of time. I think we rely more on an internal sense than others believe, and that internal sense is based on your own experiences.

https://www.cambridge.org/core/journals/european-review/article/why-the-days-seem-shorter-as-we-get-older/2CB8EC9B0B30537230C7442B826E42F1

Honestly I think it’s just that you’re always busy. When you’re younger you have more 余裕, more free time. But as you get older that slowly disappears. You get better at doing many things in quick succession and balancing a TODO list in your head. As a parent you’ve got like no time. You can’t work late, so you have to pump hard during the day, because after hours it’s kids time. And then it’s get things done while the kid is asleep time.

There’s no slow down time. I’m not sure if it’s stress as much as it’s just that you’re always focused on getting something done.

It's how brains work. Our brains are efficient. Brains require electrical signals or electricity to function. To put it simply, it consumes electricity. So the more efficient it is, the less energy it consumes and the more it's better for you.

Brains don't remember everything because all the things are not important to you. It works on cues. If it gets cues from you that something is important enough for you, it'll remember it. Otherwise, it won't move that event to the permanent memory.

You give cues to your brain in various ways. One of them is by repetitions. When you're repeating something, your brain gets the cue that it must be important for you to remember or something to that line.

Seems like a reasonable explanation.

I read something about this a while back. I believe the reasoning was that it was based on experience, memory, and information retention.

When you are a child, you haven’t experienced much so every moment appears to take forever, but as you age and live more experiences, your sense of time shortens as you’ve likely encountered it or something similar in the past.