3:

1. T. 2. F. 3. T. 4. T. 5. F.

4:

go to university - adolescent.

become a grandparent - senior-citizen.

get married - adult.

leave school - adolescent.

have children - adult.

be born - child.

retire - senior-citizen.

start work - adult.

learn to walk - child.

learn how to drive - adult.