Hi EL_Roy!
Love your age regression stories and I have an idea in mind for one, if you're looking for inspiration. It's about an elderly woman who always wanted to have children but always her career first. She hears about an experimental medication that can help reverse menopause but hasn't been tested on humans yet. She decides to volunteer, thinking that she had nothing to lose due to her age and becomes successfully pregnant. The doctors and scientist suggest that she starts exercising to help her frail body carry the extra weight she'll be putting on, but after a month she notices that she's becoming more youthful, energetic and MUSCULAR! By the time she delivers the baby, she's become a 19-20 year old looking Ms Olympia competitor.