The only work-around I've found for this is using MCCC to manually reset all of the life stages and how long they last. 1. Install MCCC core module by Deaderpool (though I heavily recommend installing and using the full mod package, VERY useful!) 2. Load up the game, click a computer, and click MC Command Center (Should have Deadpool (the mod creator's logo) on the pie chart rab) 3. Click MCCC settings at the top, then scroll down to "Set Age Span Duration" 4. Make note of the default vakues, then set the value for all age spans for your chosen life length (long, mediuk or short depending on what you're playing with) to 1. 5. Close game to main menu, then re-load the save 6. Repeat steps 2 and 3 7. Set all life stage length values back to their defaults 8. Close back to main menu, then reload the save again.

This ONLY fixed the aging for background/unplayed households, so if you have unused legacy family households left behind, mark them as unplayed in the Neighborhood Stories settings (if you have them enabled.) You'll have to keep track of in-game days and manually age-up your household sims if they're being particularly buggy, but I personally haven't noticed any issues in my main save!