It may function normally for years, sub-optimally for years or it could shut down completely at any time.
Ovary removal and post-
hysterectomy ovarian failure is associated with a number of age related conditions such as heart disease, osteoporosis, dementia, Parkinson's, memory and cognitive impairment, lung cancer, vision changes, hair and skin changes, sexual dysfunction. Estrogen may help with symptoms and may mitigate some of the risks.