High aspect ratio gold nanowires with single crystalline surface have long been a missing piece in the toolbox of plasmonics metal nanostructures. Such wires are now made with a room temperature, surfactant assisted chemical synthesis in acidic aqueous solution. The diameters and lengths of the multiply twinned gold nanowires can be tuned by varying the anount of seed particles and acid in the growth solution. Nanowires with diameters around 35 nm and lengths upto 10 mu m were made with a low seed concentration in pH-1 solution.