Mila Kunis Battles Christina Applegate in 'Bad Moms'

Okay, so, this looks horrendous, but aside from the general awfulness of this trailer, am I the only one who is confused as to why Mila Kunis's kids look about 12 and 13 in this? Is she really supposed to have had them as a teenager? It looks like it's supposed to be completely normal, but Mila Kunis is in her early thirties and looks very young, why would they make her kids adolescents? I know people can get started early, but it seems like it'd make more sense if they were around 5 or 6 years old at most, wouldn't it? Especially because she also looks like she's well off and with some kind of important job...yeah, not buying that. She's miscast here, but something tells me they didn't want this film headlined by only fortysomething women. Typical.