Psychologically speaking, when is half of your life lived?

Question

Let's make the assumption that the rate at which a person experiences time, or how fast time seems to "fly," depends on how much time the person has previously experienced.

More the the point, let's say that someone is born on January 1, 2000. A ball which had been held at a height in a uniform gravitational field, is dropped and starts to fall. The person's first year of life corresponds to the ball falling though the first meter.

The interval of calendar time from 1 Jan 2001 to 1 Jan 2002 corresponds to the ball's drop from one meter to two meters below the release point. And so on.

The idea is that each meter the ball drops corresponds to a calendar year of the child's life, but, rather than being proportional to the child's calendar age, the cumulative time in which the ball has been falling is proportional to the child's psychological age.

Assume the person lives to a calendar age of 72. At what age is his life half over, psychologically speaking?

Answer 1

Interesting question. Mathematically speaking the experienced time is not linear but logarithmic. (One year of a 10 years old child correspond to 5 years of 50 years old adult, both are 10 percent of their life.) I think, that to obtain some realistic results we have to cut off some time from our early life, otherwise this period of life would be overestimated. (First second of a newborn child is infinity compared to his previous life.) I do not remember anything what happened before I was 2 years old. I remember very little what happened between 2nd and 4th years of my age. But I remember quite a lot what happened after I was 4 years old. So perhaps we may cut off first 2 or first 4 years. Then the half life between 2 and 72 years is about 12 years, and the half life between 4 and 72 years is about 17 years. I think it corresponds to reality and to the the importance of the childhood in the memories of seniors.
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Answer 2

You're crazy. It's 36, because the psychological age has not yet been separated from that of a physical life. The ball represents psychological age, and for each physically lived year it drops one meter through space. You're saying, if someone lives to 72, and that ball drops 72 meters, how old will they be by the time they have lived half their life psychologically if the ball represents those psychological years? Well, half of 72, of course. Why would it be any different?

Answer 3

71

Answer 4

Psychologically speaking, half of the life is lived every moment as end of life can never be known to the living one. Only others know the end of one's life, not that one who died.

Answer 5

I agree with Amy, 71

Answer 6

When you have completed half of the things you want to achieve in your life