User blog comment:SayuriDarling/The Mark of Athena Official Discussion/@comment-4515675-20121019094946/@comment-3146930-20121021041544

A couple months does not mean 8 and normally means just 2. This was also in a flashback and she had been at the Wilderness school for three months by the start of The Lost Hero. Then The Son of Neptune takes place 6 months after The Lost Hero so from the time Piper stole a car and found out it was Jason's be day, it had been about 9 months, which in know way is close to a couple months. As far as Leo's age, considering Piper and Leo are good friends and one the same field trip, it can be assumed he is as old as Piper as they seem to be in the same grade. So Leo is either older than Jason or younger by only about 2-3 months.