@Wyrmelin So I just read through EgonVM’s Ultimate NPC guide, and apparently the game picks a Sim with “at least 5, ideally 8 levels” in whichever skill they’re performing. There doesn’t appear to be an age check when pulling from existing Sims, though if generated for the role they won’t be kids.
I’m wondering if perhaps an age check should be added, now that the base game update with GRO has allowed child sims to gain adult skills (like piano) simultaneously with the child skill instead of after maxing it. There will be more skilled child sims now, rather than just the rare prodigy.
https://answers.ea.com/t5/Game-Questions/EgonVM-s-Tuning-File-finds-on-The-Sims-Forums/m-p/13547931#M84824 
