Aging on or off by My Households/Other Households.

With the Sim aging options, I would like an option to turn aging on or off for My Households/Other Households. There are now some Sims that are unplayable that I would like to keep from aging that you can’t play like Father Winter and the sages that I don’t want to see die and be replaced. Then there are others that I would just like to keep around as well. Additionally, moving households to and from My Households is less time consuming than going in and loading each households lot to separate the sims you want to keep from aging from the ones that you want to stay in the stage of life that they are in.