Board Thread:Wiki Discussions/@comment-25358381-20140918020735/@comment-26302001-20140918232202

Jiraiya was 18 when he started training them, he trained them for 3 years. Nagato was 10 when he started training them that means he was 13 when the training ended and Jiraiya left to Konoha and became Minato's Sensei, Minato was 10, that means Nagato is 3 years older than Minato. Look at this guide and its references.