A Pre-teen Pack

Your argument is very well thought out. I read it all the way through and find I do agree.  I was troubled that teens in the Sims 3 looked way too young to even think about driving a car, let alone learning how.  I do think the cutoff should be 13-15, though. 16 is the age here to be considered old enough to drive.  So, perhaps they can get a permit at 15, just days before they are to age up to an older teen, who in many ways is a YA or very close to being one.  But, yes most of the mood-swings do seem to occur at this earlier time.  Here in the USA, an 18-year-old can sign contracts and get married without parental consent. (As stated, they are just about YAs in their late teens.) In the 18th century (1700s for those who get confused), teens were considered adults. They said of my 6th times great-grandparents that all ten of their children made it to adulthood.

I would be pleased to have such a pack in my game.

I understand where you are heading, but I have to remind you that we already have 8 lifestages and out of those 8 only young adults and adults are not ultimately ignored. Just a reminder, we only got two kits for kids, with another one containing one outfit for kids and no kit for toddlers and infants. Kids, toddlers and infants got almost zero outfits and activities in latest EPs, with teens only being better, because for the game they are basically adults, so, they can wear all the adult outfits and do a lot of adult activities. And don't even let me start with elders.

With that said, I'd rather for Maxis and EA to concentrate on the lifestages we already have, than creating new one that, after the initial pack dedicated to them, will end ignored like the rest.

I don't want a younger teen, I want a preteen Lifestage to be introduced to the Sims franchise that goes to middle school, Also hots puberty and progress into likes and dislikes especially style wise which can change as they change into an adult like a kid they favorite was pink then preteen it can still be pink or change to red and as a teen it stays or change to black. Same thing style like from wearing sneakers as a preteen to wearing sandals as a teen, wearing a full bathing suit, to a bikini or shorts to show off abs lol. Maybe even change friends like your childhood friend have different values and grew apart as teens or y'all stayed best friends. 

also middle aged before elder