There seems to be a similar reason behind dividing the life between the four ashrams or period..
This is how one starts, leading a disciplined life with the mastery and control of instincts (biology)
Once the instincts are conquered, one learns to live in accordance to family and people (society)
After family, next comes the pursuit of intellect (mind)
The final step in evolution is to reach above all three and renounce everything!