The other thing is that the mature women in the bookclub on the whole look much better at being their age (Madison, Maddie, and Anna, even Noji looks more her age in the bookclub scene) but it's hard to believe Charlie is old enough to have Robin. She could easily pass for a student. It's a weird choice more than anything because you have these two people in the same scene sowing remarkably different ages - which makes it a choice, because can immediately see Ocean can render age (for example, Claire looks loder than Bella, but still seems like Amber's younger sister.) Anyway, in the same scene:
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Compare Charlie to Madison. Would you think Chalie has a daughter or Madison? Remember Molly is Aziz's mum and she looks like a grandma. It's pretty haphazard as to who gets an ages look and who is blessed with the super moisturizing genes.