The poor old man is in his second childhood and doesn't know what he's saying.这可怜的老人年老昏聩，自己也不知道在胡说些什么。Even in his dotage, the Professor still sits on the committee.即使已经年老昏聩，那位教授仍然出任委员会委员。Her grandfather's in his second childhood and talks nonsense most of the time.她祖父年老昏聩，大多数时候总是不知所云。