The names are a bit backwards, but I guess inverting the sense of age would make people angry :-)

I do not believe copy-and-paste of 3 lines is copyrightable, but in any case feel free to include in ikiwiki under the same terms.
[[DavidBremner]]

You can already do do sort=age reverse=yes [[done]] --[[Joey]]

<pre>
From 2fb2b561a678616bb0054a2d7a9d29df11998bc2 Mon Sep 17 00:00:00 2001
From: David Bremner <bremner@pivot.cs.unb.ca>
Date: Fri, 29 Aug 2008 15:05:41 -0300
Subject: [PATCH] add sort='youth' to inline plugin

---
 IkiWiki/Plugin/inline.pm |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)

diff --git a/IkiWiki/Plugin/inline.pm b/IkiWiki/Plugin/inline.pm
index d2e5832..9e52712 100644
--- a/IkiWiki/Plugin/inline.pm
+++ b/IkiWiki/Plugin/inline.pm
@@ -194,6 +194,9 @@ sub preprocess_inline (@) {
        elsif (! exists $params{sort} || $params{sort} eq 'age') {
                @list=sort { $pagectime{$b} <=> $pagectime{$a} } @list;
        }
+       elsif (! exists $params{sort} || $params{sort} eq 'youth') {
+               @list=sort { $pagectime{$a} <=> $pagectime{$b} } @list;
+       }
        else {
                return sprintf(gettext("unknown sort type %s"), $params{sort});
        }
--
1.5.6.3
</pre>
