Age Verification Page & Search Engines...
 

What is the best way to do an age verification page without damaging your search ranking?

Good question. here is a bump for you

bump bump bumpety bump

What about some piece of javascript pop-up asking for age confirmation instead of a whole warning page?

Obvious answer is why bother

But a more useful answer would be to use a floating div and place it at the bottom of your code and use the least amount of wordiness you can muster.

Once done, use css to position the div to appear over your content and your done.

But again why bother, just register the site icra safesurf and blah blah