Make a photo look old

Step 1 - Open the photo
If it isn't already open, open the photo you wish to modify.
Step 2 - Turn down the saturation
Choose Adjust > Hue and Saturation > Hue/Saturation/Lightness. In the dialog, set the Saturation value to negative 60 (-60), and then click OK.
Perform this step for me.
Step 3 - Add noise
Choose Adjust > Add/Remove Noise > Add Noise. In the dialog, choose the Uniform option, set the Noise value to 15, and mark the Monochrome checkbox. Click OK to add the noise.
Perform this step for me.
Notes and Tips:
You may also want to try two effects accessed by choosing Effects > Artistic Effects: 1) The Aged Newspaper effect creates a brownish, old newspaper look; or 2) The Halftone effect applies a newspaper photo halftone dot pattern look.
Since colors in aged photos tend to be less saturated, you may want to perform Step 2 above regardless of what other photo aging method you use.
If you've digitized an old black and white photo and wish to hand tint (colorize) it, you can see how this is done by clicking the "View a movie about this topic" link below.

Learn More:
View a movie about this topic
Modify a photo via blend modes
Make a selection greyscale