Is it true that marrying old women causes sudden death, or that it is among the things that destroy a man, and does that mean there is an age at which a woman should stop having sexual intercourse?

There is no evidence in Islamic law that specifies an age limit for a husband to have intercourse with his wife. What has been mentioned about marrying elderly women being among destructive acts or causing sudden death has not been proven in any authentic narration. Rather, it has been mentioned within the discourse of wise men and physicians, such as the statement of Al-Ma'mun's physician that intercourse with an old woman causes sudden death.