How old is Krang?
 

does anyone know?

Ask him to play brain age on the nds so we can find out.

He's gotta be atleast an aeon.

In Archie he reveals his age in the special where they go to Scotland, I forgot what it was though.

Krang's age
 

Krang says he lived 300 years earlier in this

http://tmntentity.blogspot.se/search?q=scotland

But it's probably Earth years.

For him, Earth years would not be the most important, but wather a year for him would be what it takes for his home planet to rotate around its star, of course.