Dave Scotland for CGswot uses trapcode particular particles in adobe after effects to create an aged film look including dust, scratches and flicker. You can download the project file if you register with CGswot.
“A great way to take modern footage and turn it into vintage looking aged film, using particles…Learn how to create film scratches, dirt and dust using Trapcode Particular, which can be saved as an importable element for future projects…Learn how to color correct the footage for an aged, vintage film look…”