If your grandparents seem wiser and more caring than you there appears to be a scientific reason for it.

如果你的祖母或者祖父在你面前表现得既体贴、又超自信，教你这教你那，不停地告诉你：他们吃过的盐比你吃的米还多，千 万别认为他们是“倚老卖老”。