The oldest pair of scissors that still exist come from Egypt, and were made around 300 B.C. But these scissors were not like the ones we use today.
Instead of two blades connected by a screw, the scissors of the ancient Egyptians, Greeks, and Romans were made out of one piece of metal, with two blades connected by a curving handle. To make the scissors work, a user had to press the blades together with his fingers.
This kind of scissors was still being widely used in the Middle Ages, but there are records that the kind of scissors we use today was in the hands of Spanish barbers and tailors by the year 500.