Illustrious thinks all mature women are curvy milfs. However, I know from experience this is not the case, so this is an attempt to create more realistic middle-aged women in illustrious.
Trigger is midagewo
You may also wish to add wrinkled to your prompt for more realistic faces, and collarbone helps get more realism around the neck and throat.
If this one proves useful i'll try adding some other ethnicities.