1. I have all traits unlocked for all ages with my EGC mod, so that’s why Stephan is displaying some personality traits that are characteristic of older Sims. The EGC is a core mod that does a whole bunch of things, including allowing teen-only households, unlocking all traits for all ages and allowing teens to have adult wishes, like WooHoo With So-And-So, Propose Marriage to So-And-So and Move In With So-And-So. It also enables teen pregnancy/WooHoo/marriage/move in, along with about a zillion other things that you can mix and match to suit your own preferences. I have a link to it on my Resources page.