13in of Wavy Virgin Chestnut Brown Hair

I have 13in of virgin chestnut brown hair. It’s naturally wavy with natural blonde and auburn highlights. It can get very voluminous and 5in thick in a ponytail. I don’t smoke or drink alcohol, I eat a mostly vegetarian diet and I’m very health conscious. My lifestyle is very active and stress-free. My hair washing routine is 2-3 times a week with salon-quality shampoos, argon oil and conditioners.