"I'm a master of speaking silently-.."

Sure papi

While most of the fandom seems to now understand that Levi’s age is not, in fact, 34, but rather unconfirmed, there’s still enough speculation to add my two cents. 

All we know from Isayama is that ‘Levi is older than he looks.‘ People took this by meaning he’s in his mid to late thirties and “canonizing” his age as about 34, but I think it’s simply not the case. To illustrate why, I went ahead and picked multiple pictures of him alongside Mikasa and Eren much younger than him, as well as alongside other grown adults, including his squad, Erwin, and Hange.

Something is completely clear by doing so: Levi looks like he could be as young as Eren and Mikasa, at least face-wise. He has a cheeky face and large eyes, and even Petra and Hange’s faces, the faces of women, are longer than his. Petra’s eye size is similar, and even Hange is drawn with doe eyes when she lifts her goggles, but that alone is interesting– his eyes are as large as a woman’s.

The differences between Aururo, Erd, Erwin, and Gunter and Levi, with their more noticeable chins and their bigger noses, proves a point: When Isayama says that Levi is younger than he looks, he is referencing the fact that face and height-wise(even if he has a very masculine, adult body, as spoken about here), he looks like a fifteen-year-old boy.