I sometimes have to move out a child with another adult or teen so they don't age up so a sibling and or someone else can be younger or older or the adults can grow older and this all depends on the story I'm playing. I play the Sim in the bin when it fits the timeline and keeps their age consistent with the Sims they are supposed to be of the same age etc. It's up to you. I never followed rotation schedules that would bore me to tears, but I do move Sims in and out so others can age and or move them in somewhere else and play them to grow much older then back home again. It's all up to you. But I would say yes, if your Sim needs to age a little so it fits the story you should play them on first rotation unless you want them to be a lot younger which I have also done that especially when it came to wanting to keep a kid a kid and a sibling much older but not an adult yet.
I have installed a mod that prolongs the life age, without having to turn aging off, so, many times I see some Sims as middle aged so they are about 25/20 days until elderly and they have to be moved around or others moved out to get them to this age, starting at 37 days before aging. Others I see as adults but not a very YA so they may be 29 days before aging to elderly. This would mean I have some Sims in their 40 and 50's (with cc face overlays etc.) and some who are around 29 or 30 and others who are 21 etc. I play a very immersive game. lol But do have to move them around sometimes to achieve my objectives.
