Why humans feel different about the length of time

The question is easy to express clearly, because the content I want to talk about is a little abstract. For example, you may also feel this way. When we were young, we felt that the year was very long, very plump, and grew up, we think that a year has been very fast, especially to 30 ~ 40 this feeling is more obvious. It seems like a call is over again in a year, Why? The basic idea today is to use mathematics to describe and explain. I will describe it first, and I will explain it in detail later. Let's take a look at the next series below.
(Main factors) 1, 1/2 1/3 1/4 1/5 1/6 1/7 ...... 1/N after reading this simple series, I believe you have already guessed what it means. 1 does not necessarily mean starting from the age, it means you have time to realize that one year has passed, one year accounts for 1/2 of your consciousness life. In another year, the length of one year accounts for only 1/3 of your life ...... In fact, people will unconsciously compare all the time of one year and his life experience to get a feeling, so the feeling of one year in our life will become smaller and smaller, Assume that You have lived to 1200 years old, and you feel like a month for a year. Just like when you have a 5-cent salary every month, you may feel that you have spent more than one RMB, but when you have a salary of 40 yuan, you feel very different when you spend 1 yuan.
However, the speed of time changes depends on another factor.(Secondary factors) Let's take a look at the next project.
0 --> 1 ① 1/(2*1) ② 1/(2*3) ③ 1/(3*4) 1/(4*5 )...... 1/(n * (n + 1) This series is calculated and changed by the main factor series. In fact, F (n) = 1/n-1/(n + 1) this is a comparison between people and the last year after one year. People will unconsciously compare with last year, For example You are on a business trip or taking a strange bus to reach a certain destination (long route). Even if you are in good spirits and are not sleeping, you will feel a long journey for the first time, time is a little slow. When you get a chance to get a ride for the second time, you will feel like this is a little faster on the same route (assuming the car is still almost at the same time, the third time, you felt the most obvious. For example, if you were driving by yourself (the same time), you obviously felt that you would soon reach the end, in fact, it is the first item of the maximum value in the score = 1/2. At last, Please carefully observe that this series is decreasing. What is different from the series is that it is also decreasing in the sense, that is to say, after you repeat n times for a certain period of time, you will not pay attention to the speed of that period of time, thinking that the difference is becoming smaller, depending on the limit of Lim F (N) = 0 infinitely small (n-> hour) You don't feel anything, for example, the bus you get off work every day, or a fixed route home at a school, as long as there is no congestion, you feel like it's almost time to go home.
The last (secondary factor) is related to the memory of the mind. This factor is generated consciously by people. Specifically, when people experience things for the first time, they create memories of things, we can also refer to these things as fragments or procedures. When people experience the second period of time, they will pre-process these memories, that is, mathematical expectations and predictions, in the first time, people knew nothing about the future time or place, and could not perform time computing. The mind was always waiting, so people tried to estimate the time in the first time period, For example: When you see a roadmap on the highway, you always know that it's getting faster. It's the next intersection, the next station, and another station, we can compare it like this every time, instead of feeling that there are still several hundred kilometers away from the end, and the first time period will be. For example, when you were a child, you were full of unknown to the future and summer vacation, the daily schedule is full of unknown. At that time, you were looking forward to it. You felt that the time was too slow. When you grew up, you joined the work. After almost a year, you went to work in the morning, got off work in the afternoon, and got off holiday, I have to go to work again, take the same route and live a similar life. The existence of such a flow action makes people feel that time has passed very fast, his mathematical model can be explained by the secondary factors above. The difference is that the more repeated actions, the shorter the time is.
Therefore, it is recommended that you change the inherent unfamiliar life, keep a fresh life, and keep up your learning status and actions. If you are not old-fashioned, your time will become full.