Fraternal Twins: How Different Do You And Your Twin Look?

My twins are 2-1/2 and when then they were born they looked nothing alike. As they got older they started to look more and more like each other. Now, they look so much a like. If my daughter had short hair you wouldn't be able to even tell which is the boy or girl. It's so weird because fraternal twins have the same DNA as singleton brother and sisters but mine look so much alike. However, their personalities are complete polar opposites. My daughter is friendly and very out going, my son is very shy and keeps to himself.