This whole "teens aren't any different from adults" thing is getting tiresome. They are different.
They're on their phones 24-7. They roll their eyes and drag their feet melodramatically when they're in a bad mood. They've got smaller frames than adults. They've got slightly higher-pitched voices. They've got a whole slew of teen-only interactions. There's character values and asking for advice. There's chance cards at school for holidays like Love Day.
I mean, that's not to say there isn't room for improvement. I'd love to see their part-time jobs provide some kind of bonus trait, or unlock scholarships once University rolls around. But on the whole, teenagers are just fine.
As for babies, I'd like to see strollers that we can place the babies in so we can take them out into the world... but other than that? I'm not particularly worried one way or the other.