Why has Sub-zero aged so badly?

As most of us know, the Original Sub-zero from MK1 was killed by Scorpion, and in turn he became Noob Saibot.

In MK2, this Sub-zero was actually the younger brother of the original Sub-zero, and has continued to be since MK2.

In MK3 Sub-zero didnt wear his usual Ninja mask, and just the outfit. This when he had the red tatoo/scar over his eye.

Now in MK3 he looked fairly young, along comes Deadly Alliance & Deception, he suddenly looks about 50 years old, has wrinkles and grey hair.

Okay time has past since then, but why has he aged so badly yet others like Lui Kang, Johnny Cage, Sonya dont look a single year older?

Its the same Sub-zero

I must admit, I like the frosty arm look he has now, but christ it must sting when he takes a piss.

This could explain it. It could be an adverse effect of ability to freeze things or something.

Anyone else have any theories?

His age might have something to do with the medallion he now posesses,frost couldnt handle the power of the medallion only subzero could.Maybe the power of the medallion has something to do with his ageing.

or maybe Deadly Aliance is not supposed to go along with the others and sub-zero's alt costume in deception is the what he looks like after he dies and noob is part in the brotherhood of shadow where as sub-zero is a lin-kai of what ever

It could be because he's a mortal, with special powers. That would explain why he looks human when he takes his masks off and Scorpion's just a skeleton without his.

hay guys what about the new cyber sub-zero where does he come into play i mean that in the campain or what ever it is called the younger sub-zero gets taken in and changed into a cyborg because his faction was changing to cyborgs like cyrax and sector. but i dont know if that changes anything but... post if u have any comments.