10
Śrīmad-Bhāgavatam
[Canto 7, Ch. 6]
another. This world is a relative world, and its relative moments of time are different. Thus the one hundred years of Brahmā are not the same as the one hundred years of a human being. From  Bhagavad-gītā  we understand that Brahmā's daytime of twelve hours equals 4,300,000 times 1,000 years ( sahasra-yuga-paryantam ahar yad brahmaṇo viduḥ ). Thus the  varṣa-śatam , or one hundred years, are relatively different according to time, person and circumstances. As far as human beings are concerned, the calculation given here is right for the general public. Although one has a maximum of one hundred years of life, by sleeping one loses fifty years. Eating, sleeping, sex life and fear are the four bodily necessities, but to utilize the full duration of life a person desiring to advance in spiritual consciousness must reduce these activities. That will give him an opportunity to fully use his lifetime.
TEXT 7
मुग्धस्य बाल्ये कैशोरे क्रीडतो याति विंशतिः ।
जरया ग्रस्तदेहस्य यात्यकल्पस्य विंशतिः ॥ ७ ॥
mugdhasya bālye kaiśore krīḍato yāti viṁśatiḥ jarayā grasta-dehasya yāty akalpasya viṁśatiḥ
mugdhasya —of a person bewildered or not in perfect knowledge;  bālye —in childhood;  kaiśore —in boyhood;  krīḍataḥ —playing;  yāti —passes;  viṁśatiḥ —twenty years;  jarayā —by invalidity;  grasta-dehasya —of a person overcome;  yāti —passes;  akalpasya —without determination, being unable to execute even material activities;  viṁśatiḥ —another twenty years.
TRANSLATION
In the tender age of childhood, when everyone is bewildered, one passes ten years. Similarly, in boyhood, engaged in sporting and playing, one passes another ten years. In this way, twenty years are wasted. Similarly, in old age, when one is an invalid, unable to