It depends! There's actually two aging settings; one that applies to your played Sims, and one that is for all other Sims in the save. So if you have played Sims aging on (or the subset active household only!) but not the nonplayed, then only your Sims will age. If you have both turned on, then yes, other Sim children will age with your Sim kid.
If you're ok with using mods, mc command center will take care of story progression in the game. I can't play without this mod. It makes sims get married, get jobs, have kids, move homes... all in the rate you find better for your game.
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Twists In Time And Space (Updated December 2nd 2018. New discord server!)
Bob Bobson (Updated August 12th 2019)
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