《隋书·帝纪·卷三》
黄河北部各郡及崤山东西部地区凡年满九十的人，册令授予太守官衔，满八十岁的人，授予县令官衔。 
其河北诸郡及山西、山东年九十已上者，版授太守，八十者授县令。 
All persons in counties north of the Yellow River and in the region east and west of Mount Xiao who are over 90 years old are hereby granted the rank of prefect, and those over 80 the rank of county magistrate.