|Canto 7: The Science of God||Chapter 6: Prahlāda Instructs His Demoniac Schoolmates|
Bhaktivedanta VedaBase: Śrīmad Bhāgavatam 7.6.7
mugdhasya bālye kaiśore
krīḍato yāti viḿśatiḥ
yāty akalpasya viḿśatiḥ
mugdhasya — of a person bewildered or not in perfect knowledge; bālye — in childhood; kaiśore — in boyhood; krīḍataḥ — playing; yāti — passes; viḿśatiḥ — twenty years; jarayā — by invalidity; grasta-dehasya — of a person overcome; yāti — passes; akalpasya — without determination, being unable to execute even material activities; viḿśatiḥ — another twenty years.
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 perform even material activities, one passes another twenty years wastefully.
Without Kṛṣṇa consciousness, one wastes twenty years in childhood and boyhood and another twenty years in old age, when one cannot perform any material activities and is full of anxiety about what is to be done by his sons and grandsons and how one's estate should be protected. Half of these years are spent in sleep. Furthermore, one wastes another thirty years sleeping at night during the rest of his life. Thus seventy out of one hundred years are wasted by a person who does not know the aim of life and how to utilize this human form.
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His Divine Grace A. C. Bhaktivedanta Swami Prabhupāda, Founder Ācārya of the International Society for Krishna Consciousness