Hair
Why do I have a Widow’s Peak? – WRassman,M.D. BaldingBlog
The widow’s peak is a left over remnant of your juvenile hairline. On the left side of the photo (this man’s right side) I drew with dots where his 5 year old hairline probably was. As you can see, the Widow’s Peak lowest boundary, goes to the highest crease of the furrowed brow, the location of the juvenile hairline.