First 20 years are testing period for anyone to earn name.

For first 20 years,engineer is  employee of businessperson.
After that,engineer does business of businesspersons.

For first 16 academic years,student has to concentrate on scientific research.
After that,graduate gets recognition of scientific researcher.

For first 20 years in film imagination field,director/actor has to go probation.
After that,director/actor starts recommendations to public views.