For me it was when I was 7 years old. I was neighbors with a family with 2 girl one of the same age and the other a couple years older. Thy would invite me and my sisters over to hang out and play. I would play with the little sister( let's call her Sara cus I can't remember her name). One day we decided to play hairdresser. She had hair down to her tail bone, jet black and silky. She gave me a comb and I started brushing her hair. It felt so good. Long and thick . I even lifted it up to smell it and she was giggling all the while. After that her hair was all I could think about. Sadly I had to move to another state so her whereabouts are unknown but that's the earliest memory I have.