That's most likely exactly the case... my newer shapes, like the Classic Pinup, Fashion Model, etc, I specifically set up to work with Adult and YA age groups, but the original Hi-Res Bodyshape series they are whatever the Maxis originals I based them on were categorized as. There are several easy ways to recategorize outfits to the YA age groups, the easiest is with a program called DataGen, which is a free download hosted by TSR. You can also do it with SimPE, by changing the Age category in the outfit properties from 8 to 48, which is what I did on later stuff (or 58, if you want it available to Elders too). It's basically just the result of me learning new tricks as I continue with the project.
