Hi Dean,
You can find the max password age from the Default domain policy.
Then You should run : CSVDE -r "(ObjectClass=Person)" -f C:\myuserlist.csv
from the command prompt to get the list of users with all their attributes saved to a file "C:\myuserlist.csv "
You can open it in excel. then you need to convert the "pwdlastset" column to date/time(by default it comes in long integer format). To convert you can use this formula in excel
=IF(K2>0,K2/(8.64*10^11) - 109205,"")
where column K is your pwdlastset column.
After you get the date then, u can calculate the difference between the lastpwdset and present date with the help of "MaxPwdAge"
this procedure applies if u have more users and u dont want to use any scripts
there is a fine brief on this topic at http://msdn.microsoft.com/en-us/library/ms974598.aspx
All the best
Srinivas Kagitapu