Do Humans Have Seven Year Cycles Throughout Life?

From the moment we are born to the day we die, human beings have seven year cycles in both physiological and mental development. In a general overview, this video explains when these cycles begin and end, and what to expect as one cycle starts and another closes.

Timeline:
Discovery: 0:43
Seven Year Cycle Chart: 4.17
Ages 0 - 21: 4:42
Ages 21 - 49: 14:28
Ages 49 - 70: 19:25
Benefit of Knowing the Cycle: 23:54
Examples: 24:29
Why Seven Year Cycles Effect Us: 40:30