My best advice for anyone attempting to do this is airbrush as little as possible as it just makes everything look blurry and takes on that overly "shopped" look used in magazines.
Instead, take some tutorials on the channels palette, know your curves and levels, and work primarily with adjustment layers on the whole image as well masking specific areas in need of some TLC.
Also, for the worn areas of the photo where it may have been bent, scratched, or dirty, try to avoid the whole Filter>Noise>Dust & Scratches. Even with Adobe CC 2015's great improvements to this feature, it's often overused and can cause a blurred effect (unless that's what you're going for). Instead try the Spot Healing tool and dodge and burn for destroyed portions of the texture of the photo itself.
Click the images below for a closer look at the restoration.