During what major stage/age does a person feel either industry or inferiority

I believe the correct answer is in the stage between the age of four and twelve.

In the one of the psychodynamic theoretic that succeeds Freud, Erik Ericson in his psychosocial development theory divides human life in eight mayor stages. In the fourth stage (between the age of four and twelve) achievement might be industry and the downside might be inferiority.