Why do we live here??

One third of our life is spent in sleeping, 10 years in old age and 15 years as youth. If a man dies @ 75 yrs, then the actual living period is only (75-25-15-10) 25 years. How he is living during this period has ought to have some meaningful purpose. If we think and apply today's scientific knowledge for our life on this earth, we will surely accept that there is a super power which is beyond our imagination and conception. In Higher Secondary Mathematics we use the assumption "Limit tends to Infinity" and in Material Physics, a basic imaginary particle called "Photon" is assumed to explain so many theories.