I'm 32 and I have the grandpa wild hairs! I had my thyroid radiated a few years ago and they seemed to start after that, along with the menopausal style thinning and small bald spots.
OK to answer the ?, I wax my eywbrows. I buy the sally hanson wax, it lasts forever. If you don't want to rip dried wax off your face alone, it's inexpensive to have it done, most places charge less than $10 for an eyebrow wax.