Board Thread:General Discussion/@comment-29092327-20180329100732/@comment-1038387-20180329105145

Nope. You can protect the entire page, or nothing.

You could warn users not to change it (and threaten with blocks for repeat offenders) with editor notes (.

A more drastic measure would be removing the age parameter from the infobox input and hiding the field within the template itself, by building an automatic function into the template with Parser functions (or maybe LUA). It would call on a separate template that has a huge list of all characters (by PAGENAME) and their age in a #Switch. If you protect that template and make sure admins update the list whenever something changes/gets revealed, it'll update. I'm not sure how many characters on your wiki have their age revealed and whether that could be manageable.