hints☆

With webttore's mask, he looked uncanny but the visibility of his eyes and mouth allowed some semblance of humanity and vulnerability to seep through, especially since he was younger at this stage. He looks human and yet, something isn't quite right.

After 35, he covers his eyes which are considered the some of the most vulnerable parts of a human (physically and symbolically) and begins to lean into the corvid imagery and symbolism (not to mention the ties Zandik has to Odin)

At 65, Zandik is fully covered and resembles a plague doctor, a figure which represents the desperate human struggle to survive. And iirc, the development of the elixir of immortality also began sometime around this age or a bit earlier so yk... his aging body beginning to fall to the hands of mortality combined with the fact that the elixir was imperfect adds to the whole plague doctor look