[flemin]

''As we get older, the years become a rapidly shrinking fraction of our total lifetime.
For a five year span, the age compared to fraction is like this:

5yrs old =1/1,
10yrs old =1/2,
15yrs old =1/3,
20yrs old =1/4,
25yrs old =1/5,
30yrs old =1/6,
35yrs old =1/7,
40yrs old =1/8,
45yrs old =1/9,
50yrs old =1/10, and so on.

When we are very young, our minds become accustomed to future events seeming to take forever to come to pass. The way we perceive time becomes set on long. This is called subjective time. Then, as we age, subjective time slowly starts to shorten, but we don't notice it at first. However, by the time we are 40, the wait for a future event is such a small fraction of the total time we have lived that the shortened subjective time becomes noticeable. By the time we are 50, five years is only 1/10 of our total lifetime, 5 percent. And smaller bits of time are a commensurately smaller fraction of our lifetime.''