Disease or symptom? Maybe lack of sexual interest is merely a symptom of other issues. For example; after menopause, some women no longer respond sexually due

Disease or symptom? Maybe lack of sexual interest is merely a symptom of other issues. For example; after menopause, some women no longer respond sexually due to hormonal and physical changes. A man married to such a woman may lose interest too. So should he dump her for a younger woman as a matter of survival?