The rule is this: **If there's a line somewhere that specifies a particular class counts as Intuitive, Self-Taught, or Trained for the purposes of generating random starting ages, it uses that column of the table.**

That's it.

If you find a class and can't find anything that specifies which column of the random starting ages table it should use, you (or your GM) will just have to make a ruling about which column is appropriate - probably by comparing the flavour of how members of the class gain their class abilities to that of other classes.

(In my personal experience, very few Pathfinder campaigns last long enough for age to have any meaningful mechanical effect; Experience points are gained rapidly enough that few characters see more than one age category before retirement. Under such conditions, generating age randomly is just a different way of pulling a meaningless number out of the air.)