I have a fifties lighting fixture in the bathroom where the electrical wires to the light are in the middle of the medicine cabinet. After I remove the cabinet and the attached fluorescent tubes, I need to move the wires they can power the new fixture about 12" higher on the wall. I don't know what to do with the old wires and if or how much new wire I will need, etc.

Did u check to see if wires come down the wall ?

Is existing light controlled by a switch?

Do existing wires go into an electric box?

Can u post a picture?

Answer these question and we will be able to help u.

Chuck