When I was small, I used to feel that time was going so slow. I have been hoping for Dragon Boat Festival (Summer), Mid-Autumn Festival, Christmas and particularly Lunar New Year. These festivals went so fast, that the hoping of them to come again became an endless wait. Not only myself have such feeling, I think most people have such feeling.
When I was small, the school terms seemed to be very long. In fact, very much longer than those teaching terms that I have been experiencing currently. I simply find time goes so fast and one hour is simply devalued to one quarter of an hour of my child time.
What the hell makes me feel like this? Someone suggested that it is probably because adults have more work to do. It is not true. When I was watching babies playing with toys, they seem to be very very busy and have so much to do with a very simple toy. Someone suggested that it is probably because poor life childhood made them feel that good things do not seem coming easily. It is not true. I have been asking similar questions to rich friends and middle class school friends. They all felt the same. Someone suggested that may be I have not obtained sufficient survey data to represent every person or a large population on this earth. Sure. I have no chance to meet people from different social background, financial background, etc.
It is almost impossible to preview what will be happened in the future. It is also impossible to remember what will be happended in the future as we do to remember what has happened in the past. Therefore it is possible to define a person's entire life experience as 1, and this value is always 1 at any age.
Entire life experience at the age of n = 1. Experience fraction for one year = 1/n. Therefore a person who is at the age of 10 has an experience fraction for his 10th year as 1/10. The same person who is then at the age of 30 has an experience fraction for his 30th year as 1/30. One can immediately see that 1/10 > 1/30. Therefore if you were 10 year old and looking forward to the next new year, it takes 1/10 of your life time to do that. Whereas if you were 30 years old and looking forward to the next new year, it takes 1/30 of your life time to do that.
I guess that is the depreciation of time value as one grows up.