How much older than the Harry Potter weasely jenny?

How Is age (must be a Harry Potter book than Jenny Weasely / Movies Reality is not)? Just curious.

Harry Potter in 1981. Family of 31 July 1980 Ginny Weasley was born 11 years born in August. Well, more about Harry Less than 1 year 1 month Jeannie. http://harrypotter.wikia.com/wiki/Harry_Potter of http://harrypotter.wikia.com/wiki/Ginny_Weasley

EIGHT SOULS (Harry Potter in Gossip girl Promo)