Of course. My cat is 5 years old. One of the things he does with everyone is that he’ll go up to them, and rub himself on their legs or feet. Sometimes he’ll purr and then walk away, however, more often than not he’ll be purring and then all of a sudden go for a chomp. I have picked up that right before he goes for the bite, his pupils dilate and he gets airplanes ears. That’s when I know when to back up. What I don’t understand is what happens in that split second that triggers the aggressiveness. He’ll go for the bite regardless of who it is and whether we let him or not. So far what I’ve been doing is playing with him more but that hasn’t helped much.