0.9 % chance of being dealt AA OR KK
but im not a math nerd i got it from a book

odds of atleast one opponent to hold AA in case you were dealt KK

#opps P(%)
1) 0 .489
2) 0.979
3) 1.462
4) 1.946
5) 2.427
6) 2.906
7) 3.383
8) 3.912
9) 4.330

odds for one opponent to hold a higher pair

own pair P(%)
22) 5.877
33) 5.387
44) 4.897
55) 4.408
66) 3.918
77) 3.428
88) 2.938
99) 2.448
TT) 1.959
JJ) 1.469
QQ) 0.979
KK) 0.489