I am somewhat unclear on the reasoning behind having this feature. If I am not mistaken when a search engine crawls your site it also creates a cache in which users can browse. This almost defeats the purpose of age-restriction.
An alternate method is to grab the VBSEO sitemap generator and use that to generate your sitemap and submit to Google/Yahoo/MSN, then continue with the 18 year old user-restriction on every page.
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