Hair

I feel like a teenager again. I just turned 24 less than a week ago, and I've never had much if any upper body hair my whole life. For the first time in my life I have chest hair, like literally. The amount of hair on my chest has increased like tenfold in the past two days, what is going on! Not only that, I use to also be able to go about 4 or 5 days without having to shave, because my facial just doesn't grow very fast or thick, but I noticed very recently that's starting to change. I feel like I'm going through some body changes that should have happened to me several years ago. I still have baby teeth though, so as long as I have those I don't think I can feel too old, ha.