Many players have exactly the same issue with teens as you do (like me, nothing to add), others will say nowadays teens are often taller than their parents or show pictures where adults played teens (Grease) and nobody noticed right? For me this are no arguments, because while a teen may be taller than their parents, they aren’t taller than themselves when they become adult. Plus the teens played by adult actors represent at least the 17/18 yr olds, I think the game needs 13/14 yr olds. And last but not least: it’s a game where life stages matter, so there must be diversity, it must be clear. Each life stage should be recognizable (using some stereotypes; yeah I know not every elder walks with a stick and bends over, but some do and I need an elder to look like one too).
I play a guy in Sims 3 who was conceived after his dad had made the genie wish where they ask for a long life. Turns out that means each life stage of kids born after that (like my sim) lasts twice as long, also in childhood. I really felt the guys frustration when he was still a teen, somewhere around his 30s and still being treated as a kid by everyone. I wouldn’t have felt that if I’d played him in Sims 4.