Answer:
I can wave my hands at you but I never say goodbye. You are always cool when with me even more so when I am high!
Marking mortal privation when firmly in place. An enduring summation inscribed in my face.
I always have to work with something in my eye.
I belong to everyone. Sometimes make you happy sometimes make you sad. I will never end until the day you do.
I am easy to see, but no one likes looking at me. Without me, there would be no you. What am I?
I am perfect with a head perfect without a head; Perfect with a tail perfect without a tail; Perfect with either neither or both.