I was just looking around the FFxi forum, and I saw a picture of a Galka, and I thought hmm, FFXIV should have age as a custimization.
Now right away I have to say there must be a limit, we don't need children and old men/women like Maat running around. but to have a a variety of ages for each face. Maybee;
Young (older teen)
Old (like this; http://wiki.ffxiclopedia.org/wiki/File:Em8a.jpg )