Good Riddles

Question: Decapitate me and all becomes equal. Then truncate me and I become second. Cut me front and back and I become two less than I started. What am I?

Question: 1 is 3, 3 is 5, 5 is 4, 4 is perfect. Why?

Question: Black within and red without with four corners roundabout.

Question: I always wait unit you're off guard or get older so you can become easier to attack. Once your body is weak, I strike inside you and try to kill you. What am i

Question: What on a woman grows once married?