Using a (regex?) loose heuristic analysis of content on a website, this feature, if enabled, would watch for the 'over 18' query and automatically click to 'not over 18' link.
Seems like this could be an extension. Or even, I know there's uBlock Origin filters that remove cookie banners (not click, but remove them, if that would be an acceptable solution). Either way, good idea. Not trying to bikeshed.