Asymmetrical follicles yield hair that curls, symmetrical follicles yield straight hair. The longer curly hair grows, the more complex its structure can be, says a study reported in a journal of ...

Let's face it, you aren't going to wake up one day in your 30s or 40s and suddenly have a mop of curly hair, but there is every chance that your hair's texture and shape will change as you get older.

or coily (very curly, coiled strands). The shape of hair follicles determines how curly or straight hair is. Round hair follicles produce straight hair, while oval and curve-shaped hair follicles ...