User blog comment:SayuriDarling/The Mark of Athena Official Discussion/@comment-7594114-20130402145059/@comment-3285234-20130404003630

Is it really that hard to understand? I'll try again.

As We all said, consider Percy's birthday and the date the events in the books happened.

The Lightning Thief started with him as 12 years old. It happened during the last days of Percy's 6th grade. It should be around May-June.

When LT ended he is STILL 12.

Then August 18 happened in between books. So Percy turned 13.

Then comes SoM. Once again it happened near the end of the School year. He is in 7th grade and STILL 13.

When Som ended he is STILL 13.

Then August 18 happened in between books. So Percy turned 14.

Then comes TTC. It happened in December. Percy is in 8th grade and STILL 14.

When TTC ended he is still 14.

Then comes BoTL. It starts with Percy scouting for a school for his 9th grade. He is STILL 14.

By the last chaper of the book comes Agust 18. So Percy turned 15.

Then comes TLO. It starts with Percy 5(or so) days before August 18. So Percy is Still 15.

Somewhere near the end of the book comes August 18. Percy turned 16 and the Great Prophecy was fufilled.