The package aging parm is a number of days (set in global admin) that a package should be in BAS status (installed in production) before the meta data of that package (VSAM records stored in CMNPMAST) are allowed to be removed during ChangeMan ZMF housekeeping. The higher this number of days, the more people like IT auditors will like it (they are often the ones who are asking for such high number of days). While many countries have laws that force such data to be kept for (e.g.) 7 years, or even more ...