What causes hormone imbalance in women over 25? and how to stop it?

Which hormones?: And how many years past 25yo? Ovaries don't typically stop functioning until early 50s eg menopause. Adrenal & pituitary glands don't commonly cause imbalance. Thyroid can become over or underactive for unknown reasons, sometimes inflammation, sometimes infection. Pancreas' insulin can become insufficient due to obesity eg insulin resistant diabetes.