If you want to clean up your ADMIN2 file from all users not having logged on for a long time you find help here:
First, create a TPXBATCH job listing all users with their last logon date (that date is stored in field VUSRDACC). Fiel 'aaa.bbb.REPORT' is preallocated with FB=80:
//SORTING EXEC PGM=SORT
//SORTIN DD DSN=aaa.bbb.REPORT,DISP=SHR
//SORTLIB DD DSN=SYS1.SORTLIB,DISP=SHR
//SORTOUT DD DSN=aaa.bbb.SORTREP,DISP=SHR
//SORTWK01 DD UNIT=SYSDA,VOL=SER=vvvvvv,SPACE=(CYL,(2,2))
//SORTWK02 DD UNIT=SYSDA,VOL=SER=vvvvvv,SPACE=(CYL,(2,2))
//SYSOUT DD SYSOUT=A
//SYSIN DD *
The result is a list like this:
1USERNAME LAST LOGON
From here you can decide which users may be removed from ADMIN2 files because they have not logged on for more than x months or years.
More details are available in technical document TEC604439.