Gallery: These 8 Actresses Aren’t Old Enough to Play Their Co-Stars’ Mothers, But They Do Anyway!

One of the many laughable parts of Oliver Stone's sweeping epic biopic Alexander was the fact that Angelina played Colin Farrell's mom (and maybe lover?), despite being only one year older than him in real life. That meant aging makeup for her and a hilarious wig for him.

Then you have Val Kilmer, who barely makes it under the wire as Alexander's father; he's 17 years older than Colin, which is pushing it.

Everyone on Boardwalk seems to think that Gillian is Jimmy's (Michael Pitt) wife, when she's actually his mother. (They often use this to their advantage.) No surprise, considering that Gretchen's only nine years older than her co-star!

When we first saw the In Time trailer, we thought that Olivia was Justin Timberlake's love interest, considering how she stroked his cheek and whispered about missing him. Not so--in this world where everyone stops aging at 25 and buys the time to live for years after that, eventually everyone looks like they graduated college together. (Ironically, Justin's older than Olivia; he's 30 and she's 27.)

Throughout the HBO miniseries she just won an Emmy for, Kate is trying to earn the admiration of her narcissistic daughter, played by Evan Rachel Wood. Sounds like a typical mother-daughter struggle... except that here the mother would've given birth when she was 10.

Let's go through the intricacies of this one. First, Eva Green falls in love with childhood friend Matt Smith. Then Matt dies, and Eva decides to clone him and raise the baby as a Matt 2.0. Matt returns later in the movie to play his own clone/son/potential LOVER for Eva.

She's 31. He's 28.

That age difference that proved to be such an obstacle in The Graduate? Virtually nonexistent! Anne Bancroft was only 6 years older than Dustin Hoffman, and only 9 years older than her on-screen daughter Katharine Ross.

16 years is another one of those line-toers... Technically you could have a kid at that age (that's what Teen Mom is built on!), but even Elizabeth Reaser's irresponsible mom in The Art of Getting By wouldn't have gotten knocked up in her teens.

Taraji's on-screen daughter Enuka Okuma may have had only a few minutes of screentime in Larry Crowne, but it didn't fool us: There's only 6 years between the two women!