Based on my own personal experiences and the experiences of many others, I have come to believe that there are certain key developmental stages that most (high-functioning?) sociopaths experience when growing up. I believe these developmental experiences are much more consistent across young sociopaths than the trinity of animal torture, fire play, and bed wetting, albeit less observable by a third party.
Sociopath child tends to slip under the radar at first because all young children are self-centered and frequently perverse. He is unaware that he is different from others until about age 11 or 12. At this age, he realizes that he has missed a cognitive/emotional fork in the road somewhere along the way (age of 4-6?), a departure from the developmental path of his peers that does not manifest itself until years later. This manifestation is characterized by a short Asperger's like social awkwardness and social rejection beginning just before the age of puberty. All of sociopath child's hormonally/emotionally driven peers are acting differently, and in ways that sociopath child doesn't understand or respect. Sociopath child doesn't play their game at first, doesn't bother to try to pretend to be an idiot like them, insisting instead that they adapt to him. They do not adapt to him, but rather reject him socially as being a nonconformist "weirdo". It becomes clear to pre-teen sociopath relatively quickly (1-2 months?) that the days of effortless fitting in that he enjoyed throughout his childhood are over. The rules have changed, his survival instincts kick in, and he realizes at some level that even if he can't understand why his peers are behaving the way they do, he must learn to adapt. Specifically sociopath teen must learn how to actively pretend to be like everyone else. In terms of mask-wearing skills, pre-teen sociopath is like the smart kid who has always "naturally" done well at school, who suddenly goes to secondary school or university and realizes that he must study to get good marks. Likewise, although child sociopath "naturally" fit in with ease, pre-teen sociopath must learn people study skills. He will use these skills in monitoring his peers to discover what he is missing and to mirror these traits back to them.
Young teen sociopath eventually overcomes this little roadblock (1-2 years?) by acquiring a baseline proficiency at mimicry and manipulation. This process hardens him to the humanity of others. To accomplish his goals, he has resorted to objectifying everyone around him, seeing them either as targets, threats, or assets.
Teen sociopath gets more reckless with his manipulation exploits as he gets more comfortable with his skills. He sometimes makes mistakes, pushes people too far, makes people very angry. These moments are frequently overlooked or quickly papered over because his peers are in such developmental flux themselves. His worst moments are written off as being hormonally based or isolated incidents. As his peers mature, however, teen sociopath's tactics will begin to seem heavy handed and artificial to them. They will tire of the manipulation and will start responding negatively to his primitive skills.
As late teen sociopath begins experiencing more pushback/blowback from his increasingly riskier exploits, he will begin to see that the majority of his life consists of manipulation and mask wearing. Late teen sociopath begins to truly understand who he is only after one of his friends hates him.
Despite his increasing social difficulties, late teen sociopath will try to ignore the warning signs that suggest that he is not just different, but damaged. This is, after all, the only way of life he has ever known. He will do anything to maintain his status quo, including going to war against anyone who would threaten it, including himself.
Self-deception will reach a fever pitch in the early twenties as he tries to convince himself that nothing is wrong with him or what he is doing. Young adult sociopath will eventually hit some form of rock bottom, however it is that he defines that to himself. If he is smart, this will be the impetus for him to do some deep "soul" searching, and come up with some other, more sustainable way of living. If he is not smart, he will keep repeating this pattern indefinitely -- cheap manipulation tricks, backlash, self-deception, return to the status quo of cheap tricks.
For the sociopaths who move beyond the cycle of self-deception, the typical age of self-awareness is early to mid twenties, although it can still happen into the early thirties.
This is what I have come to expect in the portrayal of the development of a sociopath from small child through his mid-twenties, at least in broad strokes. Again, I think these are relatively consistent experiences, at least among high-functioning sociopaths. Depending on where the sociopath is in the stage, though, they may or may not see things this way. For instance, child sociopath doesn't realize he is manipulating, pre-teen may not necessarily be able to articulate a missed "cognitive fork," etc., but I have found that sociopaths who make it out of the cycle of self-deception will more or less recognize themselves in this description. Thoughts?
