I have seen a few of these hairlines that almost touch the eyebrows. I saw one that was solid at about 1.5cm above the eyebrows. Usually, if the hairline matures, these juvenile hairlines will disappear with age. It could take until 29 years of age. In some ethnic cultures like Indians, hairlines this low are more common, and some men will maintain such a hairline into adulthood as they never develop a classic mature hairline. This is rare.