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Well, actually, no. I think it depends on your interpretation of "growing up."
Carrie, at least, seemed like she was easily 15 or 16. Tad wasn't around much because Henesy left the show, and both were clearly too old to be playing with dollhouses and rocking horses.
What you have to understand is that in that time period, girls commonly married very young. Carrie, (who seemed to be into the flirting scene already--less interested in dolls than in men) could have been married as is and would not have been occasioned much comment.
I was thinking of the marrying young, at least for girls, but I assumed that Carrie was supposed to be around 14. While her interests were clearly developing in that direction, I got the impression that she still wasn't quite considered grown up. I really don't know anything about what children played with in those days, but I assumed that they remained more like "children" for longer than they do now.