See a dermaologist
Androgenetic hair changes occur with aging, especially after menopause
You need an exam. Check for low thyroid. Review all meds, including any vitamins or herbs. Avoid harsh shampoos. Consider a hair style with no part on top. Discuss minoxydil with a dermatologist. It is easy to use, costs $4 per month. It will not grow new hair, but may slow the loss of more hair.