Curl the back of your hair to make it look more modern, depending on how you curl it. Be careful not to curl it too hard, thinking that curling it is enough, as this will result in an out-of-fashion arrangement and make you look older. Be particular about the thickness of the iron you use and how you curl it. It is OK to curl the ends of the hair loosely; curling the hair tightly from the roots will make it look tacky.