Dude there is no way Minato was 10 before the 2nd war... Jiraiya was like 18 DURING the second war.

http://naruto.wikia.com/wiki/Child_of_the_Prophecy I really don't want to go look for pages, but read that.

"While in Amegakure after the Second Shinobi World War, Jiraiya met Nagato"

"When he returned to Konoha, Jiraiya acquired his own genin team"