By my calculations, Ponyboy is 14 and is in 10th grade. Is that correct? We know he is in a higher grade than his age. And I believe Oklahoma high school only had 3 grades, not 4. So, he's 14 in 10th grade. 15 in 11th grade and 16 in 12th. He turns 17 the summer that he graduates.
Is that what everyone else believes?
I think I Hinton herself, who really Ponyboy is the mirror of was 16 in her Senior year.