How to light pilot on a old gas heater

Find the gas valve and turn to "pilot". Open the front of the heater. Either push down the valve knob or button, whatever you have. Hold down and put a long match or lighter in front of the pilot orifice. Light pilot and hold down button for 15secs. Let button up. Pilot should stay on. If not, you probably have a bad thermocouple. If it is that old, you probably don't have a thermopile.