Why Isn’t the Maturing Hairline Mentioned in Biology Classes?

If the maturing hair line is so common, why isn’t it discussed in high school or college biology or health classes especially when the genetics and human male anatomy sections are taught?

I really don’t know the answer to that question. It should be taught, just like “how to manage a checking account” or “practical economics,” but there are tremendous holes in our education if it’s just textbook learning. We are still fighting practical sex education in our schools and paying with lots of teen pregnancy. With all of our educational problems, defining the maturing hairline seems like a bit of information that may be only valuable to those impacted by the change and it rarely occurs in high school.