There is just such a HTTP header, for adult sites. It's not granular enough to set individual age ratings, just to mark a page as 18+.
<https://www.rtalabel.org/page.php?content=howtofaq>
Is that the "don't put my website into Google Safe search because it's porn" header?
Maybe we need a "it's not for kids but it's not porn either" header.
Is that the "don't put my website into Google Safe search because it's porn" header?
Maybe we need a "it's not for kids but it's not porn either" header.