The Short Version
This claim is false. No major health organization or clinical guideline issues a blanket recommendation against fasting for all women over 50. While some medical literature cautions against fasting in "advanced age" or the "elderly," these terms are not defined as starting at 50. Multiple authoritative sources — including the Cleveland Clinic, peer-reviewed PMC studies, and Harvard Health — indicate intermittent fasting can be safe and potentially beneficial for postmenopausal women when approached with medical guidance and individualized assessment.