'Divided by'

Before you turn 20 years old, be a good student.
Before you turn 30 y.o., follow somebody (a boss) and learn the passion.
DFrom 30 to 40 y.o. you have to think very clearly about what you want.
When you are 40 to 50 y.o. you have to do the things you are good at.
When you are 50 to 60 y.o., work for young people.
When you are over 60 y.o. spend time on yourself.