Do most .5/1 players fold Aces here?

[NickMPK]

Am I completely nuts to try this bluff? Villain is 30/20 through 20 hands FWIW.

PokerStars No-Limit Hold'em, $1.00 BB (9 handed)
Hero ($58)
UTG ($28.60)
UTG+1 ($140.45)
MP1 ($125.55)
MP2 ($36.15)
MP3 ($41.15)
CO ($169.50)
Button ($43.50)
SB ($121.80)

Preflop: Hero is BB with K[img]/images/graemlins/diamond.gif[/img], A[img]/images/graemlins/spade.gif[/img].
<font color="#666666">5 folds</font>, <font color="#CC3333">CO raises to $4</font>, <font color="#666666">2 folds</font>, Hero calls $3.

Flop: ($8.50) 7[img]/images/graemlins/heart.gif[/img], 6[img]/images/graemlins/diamond.gif[/img], 8[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(2 players)</font>
Hero checks, <font color="#CC3333">CO bets $5</font>, <font color="#CC3333">Hero raises to $13</font>, CO calls $8.

Turn: ($34.50) 5[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero bets $20</font>, CO calls $20.

River: ($74.50) 3[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero bets $21 (All-In)</font>, CO calls $21.

Final Pot: $116.50

Results in white below: <font color="#FFFFFF">
Hero has Kd As (high card, ace).
CO has Ad Ac (one pair, aces).
Outcome: CO wins $116.50. </font>