How many stages of development are there in human life?

According to ROUSSUAU'S division it has four stages

1) Infancy(From birth to 5yrs)

2) Childhood(From 5-12yrs)

3) Early adolesence(From 12-15yrs)

4) Late adolesence(From 15-20yrs)

According to Earnest Jone's

1) Infancy(From birth to 5yrs)

2) Childhood(From 5-12yrs)

3) Adolesence(From 12-18yrs)

4) Maturity(From 18 to above)