You know, the "they look too young to me, I apparently don't live in the real world" posts are finally sliding by me, for a change!
...
OK, maybe not.
I think RustyV's critique of Jennifer's relative head size is probably the most meaningful I've seen over the past year or so, but even that is more an artistic/modelling issue than anything else, IMHO. I suspect that happened because MrDots may have tried to make a balance of proportions for her body that didn't quite fit - e.g., if he used the Growing Up product for Genesis 3 Female to make a petite body (and, that's a common toolset these days), that tends to leave heads relatively larger than expected and manual adjustment is often needed.
As mentioned in past flareups of this topic, you can get an idea of their relative sizes from here:
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Jennifer is obviously petite, but she's not a kid - I know young women who look the same size or smaller, for example. A coworker of mine was the same relative height with an even smaller chest. There is an Assistant working at our dentist's office who is about 4'6" and rather thin, with a very young face ... and she's in her 20s.
People complaining about underage appearances may be more sensitized to that topic in this case, I feel: the characters' dialogue and actions are clearly intended to offer that they are older teens and/or younger adults in this adult game.