Nraas - Stop Teen From Aging? or Allow Teen to Age but Not Change Body into Young Adult?

I use NRaas Master Controller to set the age back to the first day of the lifestage. Sim ->Intermediate ->Age Relative and set the number to 1.

That way I can keep certain sims from aging up to the next lifestage, but I have to keep an eye on their aging in days.

I don't know if there is a mod that can keep a whole age group from aging, but maybe it's possible with a mod like NRaas StoryProgression if you set the teens as a "caste" and change some settings for them. I have no idea if that's possible, so maybe @igazor knows better?