As it stands, my TS4 game has nearly 350 “playable” sims, meaning sims that are living in houses, tracked in my databases, and played occasionally in the rotation. You wouldn’t know most of these sims. Many of them haven’t worked their way into my story yet even as background fodder, but I’ve made them myself and would welcome them to date my sims someday if they want. Any other townies in the townie bin I couldn’t care less about. They are marked as unplayed and the game can cull them if it wants to.
Thank you to the For Rent pack for giving me places to put all these sims!
So here comes the math: to keep about 350 sims at an average life span of about 75 years, I need to add about 2 sims per aging year in the town. How it actually works out is that there are fewer older sims than younger ones, as sims start to die off in their 50’s, 60’s, and 70’s. So what I aim for then is 3-4 sims born into every aging year.