Step one in making a photo look like it was taken a long time ago is to shoot something that can look old. I have the good fortune to live in driving distance to the French Quarter of New Orleans. Everything in it is really old so, though many details have been modernized, the scenes can be made to appear old to a casual observer.
Very little was done to the original photo in this mp4 except to remove the modern stickers from the nearest door window. Adobe's Camera RAW was used to brighten and darken some of the colors after switching to the black & white mode. I also used a handy Lightroom preset to at a little sepia tone. Some texture was also added. A key component of the grayscale look, I think, is high contrast.
one block of the French Quarter, in New Orleans, where everything looks old because it is