How long is a Hogwarts?
How long is a Hogwarts? Students routinely attend Hogwarts for seven years — unless you are Harry Potter and his two best friends, who blew off their senior year.
How old are 7th years at Hogwarts?
A seventh year is a student at Hogwarts School of Witchcraft and Wizardry who is in their seventh and final year of formal magical education. Seventh years are usually seventeen to eighteen years of age. The seventh year contains the most important exams given at Hogwarts — the N.E.W.T.s.