/etc/default/useradd

[root@web24 default]# vi useradd
# useradd defaults file
GROUP=100
HOME=/home
INACTIVE=-1
EXPIRE=
SHELL=/bin/bash
SKEL=/etc/skel
CREATE_MAIL_SPOOL=yes

/etc/login.defs

#   This value is default recommend for ISMS authentification!
#
PASS_MAX_DAYS   90
PASS_MIN_DAYS   0
PASS_MIN_LEN    8
PASS_WARN_AGE   7