Using Photoshop to create a 70's photo
Begin by removing most of the red. The reason that old photos (or any old printed material) has that "bluish/greenish" look is that red is the first ink color to fade. Go to Image>Adjustments>Color balance and start gently reducing the red, and adding more cyan.
To make the image more more contrasty and grainy go to Filter>Distort>Diffuse Glow. Old cameras didn't do the automatic exposure adjustments that modern digital cameras do. In sunlight, they were usually overexposed. And of course, the images weren't nearly as sharp, and they were printed out on paper, either with a Polaroid, or at your local drugstore with some type of texture.
Another trick to to tilt the image a bit. Old cameras required you to hold it up against your eye and squint through a tiny viewing hole. It was very difficult to get the image straight.
Posted by Brad Hall