Dozens of years of life, which one do you think goes by faster?

I think the age group of thirty to forty is the fastest. With a variety of things settled, the mood has been relaxed, looking at the mirror of self, face color is still okay, but there is no lack of age to take away some of the splendor of the time, and suddenly feel that the time is in a hurry to pass quickly, looking forward to fifty is very close to sixty is not too far away, the heart immediately feel very impatient and sad. Looking back on the past too many things can not take into account all aspects of their own, not properly care for themselves, and now there are some regrets and some sadness. I know that this idea is somewhat selfish component, I do not avoid the existence of this component, I think everyone has a selfish side of the heart, as long as the selfishness is not harmless to have the scale is good.