Different guy needs help

Hi. I was wondering if any of you could advise me about this crease in my forehead. I never really gave it any real notice until recently, but I can't remember when it showed up. That leads me to believe it happened over time, rather than being the result of an impact or anything like that. The obvious answer would be that it is a wrinkle, but I'm only 22. Not to mention it only goes halfway across. Any advice on how to lessen it's severity? If that's even possible.