Hair at nape of neck won't dread.
Mine are 5 years old. And I just took some of the loose hairs on my neck and had enough to form a new lock. Yeah, it's completely normal, and will probably always be there with you. As it grow in, you might have enough to create new ones, but that hair tends to be softer than the rest and last to knot up.
Gilly's Mum, I did the same thing. I took a tuft of hair by my ear and threw a bead on it 2 weeks ago. I'm washing tomorrow and if it stays as tight as it feels, I might even be able to take the bead off this soon