42 is about the time many males lose their hair. Look at your older male relatives on both sides of your family to get an idea what is in store for your cranium. Also there are meds that will effect your hair loss. Google Lyrica to see if hair loss is an issue.

I was given a statin to lower my colesterol. About 2 months into taking them I went to the barber for a haircut. She noticed large bald spots on the back of my head under the hairline. I freaked and looked closer at my mustache which was thinning, I started looking like Adolf Hitler, then noticed most of my leg hair fell out. I googled statins and sure enough losing hair is a side effect amongst many others. My doctor confirmed it while rolling his eyes and stating "Unfortunately you just happen to be one of those who are sensitive to statins. I stopped taking them and the hair grew back. Why? Colesterol is part of the makeup of hair. Remove colesterol from hair it then dies. I now take Nyacin and fish oil pills instead.