Age of ghalib (ordinary) man is 63 years old. Let's consider the time usage that often happens among us:
1 Year = 12 months = 365 Days = 8760 Hours = 525600 Minutes = 31536000 Seconds.
If in a day we spend 8 hours to sleep then a third day we have passed.
1/3 x 63 yr = 21 years for sleeping.
From 24 hours was left 16 hours lagi.dalam overnight there is worship fardhu pray 5 times if we count then:
5 x 12 minutes (salat) = 60 minutes = 1 hour.
Means only 1 hour just calculate the time consumed.
Remaining time 15 hours again, well within 15 hours this is all the routine to fill the time of day kita.bayangkan if escape from the value of worship then the big loss befall us, nauzubillah.
15 hours x 365 days = 5475 hours in a year.
5475 x 63 years = 344925 hours.
3444925 hours / 8760 hours = 39.375 years in negligence.
Such is the flashback of age usage and above calculations not including the age of aqil baligh which is the reference in taklif.