WIY, regarding being, or appearing, older than your parents, that is only for the first few minutes. After that, people will take on the appearance of their prime years.
Yekke, that is all how it applies to Halacha. However, there is no doubt a connection between a man and his wife even after death. Not that this is my reason, but why would you bury a wife next to her late husband who is by now no different than a friendly neighbor?