Original: A second clan of gods, the Vanir, is also mentioned in Norse mythology: the god Njord and his children, Freyr and Freyja, are the most prominent Vanir gods who join the Ã sir as hostages after a war between Ã sir and Vanir. The Vanir appear to have mainly been connected with cultivation and fertility and the Ã sir were connected with power and war.
Simplified: The Ã sir and Vanir were shown as near the same age as each other.