Riddle #1816

Question: Looking at my face, I'm no more than six.
Look at the rest of me and I'm 21.
You'll see my twin and me in Las Vegas.
Say my name and you'd be uttering a threat.

What am I?

Question: Tear one off and scratch my head. What once was red is black instead. What am I?

Question: What tastes better than it smells?

Question: What goes in the water black and comes out red?

Question: What has a face and two hands?

Question: What asks but never answers?