When do you think Ted actually started fantasizing about the act of killing people? I feel like with killers like Dahmer or Kemper we know because they themselves described the process in all honesty (I believe Dahmer said he started fantasizing about killing and dismembering people when he was 12?),whereas Bundy has denied his crimes for most of his life, so when he finally confessed, he didn't have the time to disclose every single detail, and a lot of stuff has been left for speculation.
It’s a little hard to tell but he started to have sexual fantasies at an early age and it just escalated from there. I’d say he probably started to have rape fantasies when he was a teenager (he was already spying girls through their windows at that time and was heavily into Detective magazines showing dead bodies of women) and according to Bill Hagmaier, Ted began to kill people psychologically years before actually acting on it. Based on these informations, he was probably around 18/20 when he first fantasized about killing. Here’s an interesting quote from Ted talking about that process :
I don’t like some of the, some of the things I’ve done and that uh, that I don’t like it, but yet I do it. And, as I say, uh, I’ve searched around inside before. And I talked to Joe (Aloi) about some things today. About a process that I went through and, and that the process of conditioning, so to speak, self conditioning and I thought there was a time when I could counter condition myself, desensitize myself. See, I made myself the way I was. I uh, I mean bit-by-bit and step-by-step and day-by-day. I don’t know why, I don’t know what spurred me on to do it. You see, I, there was a time, way back, when I felt deep, deep guilt about even the very thought of, of harming someone else. And yet for some reason I had a desire to, to condition that out of me. And I did, day-by-day-by-day. Conditioned out on an abstract level and then when it got down to actual cases, it was guilt. I conditioned that out of myself too. And I always thought, well, you let this thing grow inside you or you, you allowed yourself to be conditioned, if that’s another way to term it. I don’t know whether we’re dealing with an organic problem or behavioral problem or a combination of the two. But in any case I thought it’s possible to counter condition myself. Well that uh, takes a process of years and I don’t know if the damage was, is irreparable but in any case, it appears that by myself I’m not capable of doing it. (from the Pensacola Police Department Bug Tape., February 20, 1978).
And one from Bill Hagmaier :
If Ted Bundy is to be believed, and evidence from very hard-working detectives is accurate, he didn’t kill his first victim until he was 27 years old. Most serial killers would have struck long before that. Bundy was killing people psychologically, he didn’t want to get caught, he recognized the risk at hand, but then when he lost his temper and killed his first victim at 27, then all the things he had dreamed about doing, started to materialize.