I've had chickens for only a year and even though they all get the same treatment they've been really variable even within breeds. It also seems to vary by age, in that they go through stages of being more or less okay with humans. When they were still in the brooder they were mostly skittish no matter what I did. Once the first group got moved to the barn at about six weeks they became a lot friendlier and I have loads of photos of all three breeds (brown leghorns, barred rocks, and sapphire splashes) perched on my lap and shoulders, sometimes six at a time. Now that they're a year old those three breeds almost never perch on me any more, but they're all willing to take food from my hand and hang around when I sit with them in the run. The 15 prairie bluebells, which I added as day-old chicks in March, are getting a lot better now that they're laying and squatting for me, but from the start they've been much wilder and more skittish than the other three breeds. Only one of them will ever perch on me (the lead hen of that group), and at 6 months old only about half of them will take food from my hand.
Out of the whole flock of 28 I wouldn't call any of them affectionate. Nearly all of them will come running when I use their food call and if they're at the far end of the yard they'll come screaming and flapping over for their morning eggs. Some are smarter, calmer, and braver than others and as a group the barred rocks are the most tolerant and least skittish, but there's not one that acts like a pet.
Out of the whole flock of 28 I wouldn't call any of them affectionate. Nearly all of them will come running when I use their food call and if they're at the far end of the yard they'll come screaming and flapping over for their morning eggs. Some are smarter, calmer, and braver than others and as a group the barred rocks are the most tolerant and least skittish, but there's not one that acts like a pet.