User blog comment:Thailog/Ep. 201 "Happy New Year!" discussion/@comment-5037903-20120429235348/@comment-4955817-20120430005340

i think that miss martian is biologically 17 1/2, actually really close to eighteen, since it would seem that she ages biologically 1 year compared to every three earth years.

as for superboy, i have no idea. maybe the cloning process stopped him from aging, because you're right, he did not change much at all.