dawn of time on Azeroth, tbh we dont know the exact years of excistence, and no she isnt dawn of time, she was simply there when Azeroth was formed unless you meant dawn of time on azeroth, is there an accurate number, we know she is over ten thouand years old however, although obviously age is not the only factor in their intellect, for example pyron is millions of years older than any of these, but i rate him far lower because his only actions seem to be to eat, fight..and thats about all he does so his intelligence i would rate lower than these two.
kain is only reckless in his younger form, Elder kain is wise, Kain has been a general in several wars, kains feet of the time decisions>>Alex' and to further it he has the mind emblem which increases his mind powers greatly, he could cause Alex to think shes seeing pieces in places where they are not and ruin all her wisdom in the chess match. Kains decisions are far greater than Alex', where she has had to decide battle tactics and strategies, Kain has not only done this, but also has the fate of his entire world and its history on his shoulders. Hence his famous line in one of the vids i posted in the LOK respect thread