Okay, I've updated the hack again, this time for the LAST time. I had to modify the hack because certain members had their ages off by 1 year.
Thanks to Boofo, who PMed me with a suggestion - I have incorporated his suggestion into my hack, and this has fixed up the age problem for certain members.
The hack should be working 100% now.
To upgrade, just download the text installation file, and replace the code in the functions.php with the new code.