Arthritis and Gout. Gout is a form of arthritis -- an inflammation of the joints -- that causes sudden, severe attacks of pain, tenderness, redness, warmth, and swelling in some joints. It usually affects one joint at a time, although it can be in several joints at once.
In the third Harry Potter movie Harry Potter is thirteen years old. The character is 13 years old but in real life Daniel Radcliffe is 15.
While I generally thought that the casting in Harry Potter was excellent (Michael Gambon aside), one thing the casting directors were consistently off with was the age of the characters, in particular Harry's parents and their contemporaries at Hogwarts. This is a trend that continued with Sirius Black. Oldman was 45 or 46 when he played Black in Prisoner of Azkaban; Sirius was 33 during the events of that film. I'd also pictured Sirius very differently from how he looked in the film; he was shorter and better groomed that I'd generally pictured him.