[Scrub]

A quick edit is all that is needed.

In register.php find:

PHP Code:

    if ($year < ($current['year'] - 13) OR ($year == ($current['year'] - 13) AND $month <= $current['month'])) 


And replace that with:

PHP Code:

    if ($year < ($current['year'] - 18) OR ($year == ($current['year'] - 18) AND $month <= $current['month'])) 


And enable the option to deny registration to anyone under 13. It'll work still. Tested it and everything. So hopefully it work for you.