I have NRAAS Story Progression on. I have ageing set to epic so the whole town ages slowly. My own sims I age up with cake when I'm ready.
If I want to play multiple households I have a few different strategies.
1. I rotate play through different households and try to make sure I do it before various sims are about to age up automatically. I keep a spreadsheet to warn me when a sim is close to aging up.
2. I play a single household, but rotate sims through it. This works well for large families.\
3. I use NRAAS Traveller mod. The households I want to play but not change while I'm playing other households get moved to different worlds. They can still interact with each other by visiting and their friendship and family trees stay intact. I have the mod set to ensure only the sims in the currently played world are affected by story progression or aging.
When I play with sims in a variety of worlds, it is important to stop them from aging while you are playing in other worlds or you run the risk of arriving in other worlds in the game to find everyone has died of old age and the world is now empty.