FanFic: Age 5

Christan has a mother 25 years older and a father 30 years older.
Justan has older siblings + a mother and father the same age.

Jenny is a first child to parents age 15 and 20.
Andre is a child to parents age 20 and 25.

Jenny's parents' parents' were born 15 years older.
Chris's were 25 & 30 years older.