In Love Actually, Thomas Brodie-Sangster and Keira Knightley were only five years apart. He played a 10-year-old, and she played a married woman.
In Mean Girls, Amy Poehler played Rachel McAdams' mom, but in real life there's only a seven-year difference.
In the Harry Potter series, Shirley Henderson was 35 years old when she started playing Moaning Myrtle, a 14-year-old.
Henderson was born in 1965, and the first Harry Potter movie came out a few days shy of her 36th birthday in 2001.
In The Hobbit series, Orlando Bloom was actually two years older than the actor who played his father, Lee Pace.
Pace is currently 40 years old, while Bloom is 42.
In Selena, Jennifer Lopez played the daughter of Constance Marie, despite being only four years younger.
To be exact, J.Lo is three years, 10 months, two weeks, and one day younger than Marie.
In Forrest Gump, Sally Field and Tom Hanks played mother and son, and only six years earlier they played love interests in Punchline.
Field is not even 10 years older than Hanks.
In Mamma Mia! Here We Go Again, Cher played Meryl Streep's mom, but in reality they're only three years apart.
In Singin' in the Rain, Debbie Reynolds was cast when she was 19 years old, while love interest Gene Kelly was 40.
In Alexander, Colin Farrell was 28, while his onscreen mom, Angelina Jolie, was only 29.
In White Christmas, Rosemary Clooney was 26 by the time the movie premiered, while Bing Crosby was 51.
Clooney also played Vera-Ellen's older sister in the movie, despite actually being seven years younger.
In The Manchurian Candidate, Angela Lansbury played the onscreen mom of Laurence Harvey, who was only three years younger than Lansbury.
Lansbury was born Oct. 16, 1925, while Harvey was born Oct. 1, 1928.
In The Graduate, Dustin Hoffman (30) played a 21-year-old who was seduced by an older woman (Anne Bancroft, 36) and ultimately fell in love with her daughter (Katharine Ross, 27).
In Indiana Jones and the Last Crusade, there was only a 12-year age gap between onscreen father and son Sean Connery and Harrison Ford.
Ford was 46 at the time, while Connery was 58.
In Carrie, Sissy Spacek was 26 when she played a 16-year-old. In reality, she was only two years younger than Betty Buckley, who played her gym teacher.
Spacek was born in 1949, and Buckley was born in 1947.
In Magic in the Moonlight, there was a 28-year age gap between onscreen lovers Emma Stone and Colin Firth.
In Chitty Chitty Bang Bang, Dick Van Dyke was six months older than Lionel Jeffries, who played his father.
Both actors were born in 1926!
And in Grease, noooooo one was even close to being a 17-year-old in high school.
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