What specifically is telling about Left's neck? Looks the same as Right's neck. My vote is for middle just because she's wearing her watch over her sweater sleeve in a lame-mom-but-who-cares-I-still-look-like-my-daughters way.
Its all about perspective, but I think I can tell who is the elder statesman. Dont think its impressive at all to have a kid at 15. Youre a facking kid having another kid. Raising a kid RIGHT at 15 on the other hand is a different story. Would let all trey slob on da knob at the same time.