For millions of fans around the world, the Harry Potter franchise has been one of the most consistently entertaining (and lucrative) series in movie history. For the actors who played the young wizards of Hogwarts, the series is more like extremely expensive home movies: they literally grew up in front of the camera. With "Harry Potter and the Half-Blood Prince" in theaters now, we have put together a gallery of how the Harry Potter kids changed over the years, along with how old they were when each movie was released.

ACTOR: Daniel Radcliffe
BIRTH DATE: 7/23/1989
BIRTH PLACE: London, England
NOTES: Unlike some of his counterparts, Radcliffe already had movie experience before donning a cloak for Potter. He appeared opposite Pierce Brosnan in 2001's "The Tailor of Panama."

Photo by Warner Bros. Picture, Everett CollectionMOVIE: "Harry Potter and the Sorcerer's Stone" (2001)
AGE AT TIME OF US RELEASE: 12

Photo by Warner Bros. Pictures, Everett CollectionMOVIE: "Harry Potter and the Chamber of Secrets" (2002)
AGE: 13

Photo by Warner Bros. Pictures, Everett CollectionMOVIE: "Harry Potter and the Prisoner of Azkaban" (2004)
AGE: 14

Photo by Warner Bros. Pictures, Everett CollectionMOVIE: "Harry Potter and the Goblet of Fire" (2005)
AGE: 16

Photo by Warner Bros. PicturesMOVIE: "Harry Potter and the Order of the Phoenix" (2007)
AGE: 17

Photo by Warner Bros. PicturesMOVIE: "Harry Potter and the Half-Blood Prince" (2009)
AGE: 19

ACTOR: Emma Watson
BIRTH DATE: 4/15/1990
BIRTH PLACE: Paris, France
NOTES: Though she trained at the Oxford branch of Stagecoach Theatre Arts as a child, Watson never acted professionally until she played Hermione Granger. Since then, she's been in two non-Potter movies: "Ballet Shoes," and "The Tale of Despereaux."

Photo by Warner Bros. Pictures, Everett CollectionMOVIE: "Harry Potter and the Sorcerer's Stone" (2001)
AGE AT TIME OF US RELEASE: 11

Photo by Warner Bros. Pictures, Everett CollectionMOVIE: "Harry Potter and the Chamber of Secrets" (2002)
AGE: 12

Photo by Warner Bros. Pictures, Everett CollectionMOVIE: "Harry Potter and the Prisoner of Azkaban" (2004)
AGE: 14

Photo by Warner Bros. PicturesMOVIE: "Harry Potter and the Goblet of Fire" (2005)
AGE: 16

Photo by Warner Bros. PicturesMOVIE: "Harry Potter and the Order of the Phoenix" (2007)
AGE: 17

Photo by Warner Bros. PicturesMOVIE: "Harry Potter and the Half-Blood Prince" (2009)
AGE: 19

ACTOR: Rupert Grint
BIRTH DATE: 8/24/1988
BIRTH PLACE: Watton-at-Stone, Hertfordshire, England
NOTES: Grint has appeared in several non-Potter flicks including this year's very adult role in the coming-of-age drama "Cherrybomb."

Photo by Warner Bros. Pictures, Everett CollectionMOVIE: "Harry Potter and the Sorcerer's Stone" (2001)
AGE AT TIME OF US RELEASE: 13

Photo by Warner Bros. Pictures, Everett CollectionMOVIE: "Harry Potter and the Chamber of Secrets" (2002)
AGE: 14

Photo by Warner Bros. Pictures, Everett CollectionMOVIE: "Harry Potter and the Prisoner of Azkaban" (2004)
AGE: 15

Photo by Warner Bros. Pictures, Everett CollectionMOVIE: "Harry Potter and the Goblet of Fire" (2005)
AGE: 17

Photo by Warner Bros. PicturesMOVIE: "Harry Potter and the Order of the Phoenix" (2007)
AGE: 18

Photo by Warner Bros. PicturesMOVIE: "Harry Potter and the Half-Blood Prince" (2009)
AGE: 20

ACTOR: Tom Felton
BIRTH DATE: 9/22/1987
BIRTH PLACE: London, England
NOTES: Before playing Potter's nemesis Draco, Felton appeared opposite Jodie Foster and Chow Yun-Fat in "Anna and the King."

Photo by Warner Bros. Pictures, Everett CollectionMOVIE: "Harry Potter and the Sorcerer's Stone" (2001)
AGE AT TIME OF US RELEASE: 14

Photo by Warner Brothers, Everett CollectionMOVIE: "Harry Potter and the Chamber of Secrets" (2002)
AGE: 15

Photo by Warner Bros. Pictures, Everett CollectionMOVIE: "Harry Potter and the Prisoner of Azkaban" (2004)
AGE: 16

Photo by Warner Bros. Pictures, Everett CollectionMOVIE: "Harry Potter and the Goblet of Fire" (2005)
AGE: 18

Photo by Warner Bros. PicturesMOVIE: "Harry Potter and the Order of the Phoenix" (2007)
AGE: 19

Photo by Warner Bros. PicturesMOVIE: "Harry Potter and the Half-Blood Prince" (2009)
AGE: 21

ACTOR: Bonnie Wright
BIRTH DATE: 2/17/1991
BIRTH PLACE: London, England
NOTES: Bonnie auditioned for the part of Ginny Weasley because her brother thought she was like the character.

Photo by Warner Bros. Pictures, Everett CollectionMOVIE: "Harry Potter and the Chamber of Secrets" (2002)
AGE AT TIME OF US RELEASE: 11

Photo by Warner Bros. Pictures, Everett CollectionMOVIE: "Harry Potter and the Goblet of Fire" (2005)
AGE: 14

Photo by Warner Bros. PicturesMOVIE: "Harry Potter and the Order of the Phoenix" (2007)
AGE: 16

Photo by Warner Bros. PicturesMOVIE: "Harry Potter and the Half-Blood Prince" (2009)
AGE: 18