TESTIMONY_GIVER:
  He was born in 1991.  The one who was born in 1979 is in standard 9.  They are both in standard 9, as well as the on who was born in 1980, and the one who was born in 1983 is doing standard 6.  The one who was born in 1989 is grade 1, and the last one is at nursery school.