User blog comment:Memnarc/Character Ages/@comment-7948498-20130907091743/@comment-2168633-20130908015901

Momo and Nana joined Rito's school. Normally in order to join the class they joined they would need to be 14, HOWEVER we know for a fact that Momo wanted to be in the same school as Rito and that she only wanted to go to an Earth school for this purpose alone. I.E her joining a school does not prove anything. You need to take into the consideration of what is actually shown in the manga and who says what. It is obvious that the princepall allowed Nana and Momo to join the school because they were cute. (see page 14 of the prologue).

The Momo fan-club can only base their info on what they have available to themselves in the manga universe. I.E their beleifs don't verify anything other than this is what they believe (which isn't that odd since people in Momo's class should be 14) But Golden Darkness, what was she? 24? is proof that this isn't the case. I.E we can't take their info as definite proof.

If Nana and Momo HAD been 14, then they would have affirmed this to be true when Yui asked them... instead Momo deflects the question with saying "Don't worry about the small details". (Yui then had a telling 'flash' in her mind of the princepal where she realizes the truth)

But why didn't Momo asnwer out right? Rather, why would the author do this? The truth is as simple as it is depressing. The changed Tokyo laws. The new Tokyo Laws are cracking down on pervy stuff. Avoiding some of the flack, the manga-ka here has simply opted out and left the question unanswered (while hinting at the truth by character portrayal)

More proof found in the manga can be seen in the way the characters are drawn. The takoubon is always edited making Momo's breasts smaller (since the takoubon is allowed to be more pervy) Meanwhile, look at Lala. When Lala showed up she was 15 years old. Momo and Lala are sisters... Nana hasn't grown much in height or breast size since that time... and Momo... she is as small as Mikan and her breast size isn't even half of what Lala's was when Lala was 15.

How can you say that Momo and Nana look 14? They are around 150cm (same height as Mikan) Nana has no breasts and Momo's are really small. (check the takoubon) NOBODY except for Momo and Nana herself make any comments about her chest being small. Nana is obviously upset because her TWIN has "big" breasts when she doesn't so she feels very conscious about it and Momo always enjoy teasing her lazy sister about everything and anything.

Every single thing in the manga suggests that they are Mikan's age!

That said, I am willing to compromise for the sanctity of things. Since there has never been any official character age sheets for either Momo or Nana... then the wiki here shouldn't give any ages for them until official sources (word of god) provides us with a resolution to this issue.