LIVE POLL: She's Too Young to be Their Mother

Sometimes the casting of a mother and child doesn't exactly follow the rules of logic. Which of these mother-child relationships was most believable to you, despite the fact that the "mother" was too young to have given birth to the "child"? 

Absolutely Fabulous - Jennifer Saunders (34) to Julia Sawalha (24) 
Alexander - Angelina Jolie (29) to Colin Farrell (28) 
Back to the Future - Lea Thompson (24) to Michael J. Fox (24) 
Boardwalk Empire - Gretchen Mol (38) to Michael Pitt (29) 
Cool Hand Luke - Jo Van Fleet (52) to Paul Newman (42) 
The Fighter - Melissa Leo (50) to Mark Wahlberg (39) 
Forrest Gump - Sally Field (48) to Tom Hanks (38) 
Golden Girls - Estelle Getty (62) to Bea Arthur (63) 
The Graduate - Anne Bancroft (36) to Katharine Ross (27) 
The Manchurian Candidate - Angela Lansbury (37) to Laurence Harvey (34) 
Mean Girls - Amy Poehler (33) to Rachel McAdams (26) 
My Left Foot - Brenda Fricker (44) to Daniel Day-Lewis (32) 
North by Northwest (1959) - Jessie Royce Landis (63) to Cary Grant (55) 
Riding in Cars with Boys - Drew Barrymore (26) to Adam Garcia (28) 
Step Brothers - Mary Steenburgen (55) to Will Ferrell (41) 

List: http://www.imdb.com/list/ls070092396 
Poll: http://www.imdb.com/poll/69LrT7VqbXM
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Went live 8/24/14