Originally Posted by anomie
You may force a user password change on RHEL5 using the chage(1) command. Please read its manpages.
# chage -M 3650 -d 1985-01-01 <user_here>
A better solution is
# chage -d 0 <user_here>
ie, if the user has never changed their password, it will force a password change.
In your example, if the password inactive field is also set, it may lock the user out entirely due to the user not changing their expired password in 26 years.