When was the very first razor invented ie to shave a mans face?

I don't mean a safety razor. I mean any sort of implement that was used to remove hair from a mans face ?|||In the bronze age. The Greeks would use bronze razors to shave.|||a long time ago...not as long as the greeks though man!|||I believe it was somewhere back in the new Stone Age or may be the Old Stone Age when the people began to use something.