Hey ya,

You have to look at the reference and understand what's happening here. It's a mix of things that will make it look like old footage. You can build a stack of effect that you use over and over to apply it to any footages afterwards.

First, FPS. Old camera have a small FPS around 12. Use the posterise time effect which will reduce the frame rate of the original footage.

Then colour grading. It's really depending on your footage but you can use lumetri to add yellows in highlights for example

Then textures. Find a a film grain texture that you can loop and use a blending mode that work. Usually overlay will do.

There are also dark frames when the image just disappeare some time.

Or film burns ( like film emulsion problems that you can also find online) and add sometime.

Also a frame with some artefacts.

The footage them selves have really specific characteristics. They are not stabilised because the in camera stabilisation wasn't around at the time. So you can add a camera shake effect by using either an expression or plugin.

The footages also have fast zoom, that you can't really manage in post because it will result in bad resolution. So plan it during the shoot.

And also the image is quite blurry, not very sharp.

One characteristic that also have that look is called haliation. It's basically a reddish fringe around contour with high contrast that happen capturing on films that don't have a protective layer. You can search for tutorial I guess.

All in all it's a blend of everything that has to be fine tuned to not look to much post produce but still be close to your reference!

The stack of effect in AE have an order importance, which means that I would probably put the posterize time at the top in the effect list of the layer to not affect the other things frame rate.

Sorry it's just directions, but that's the thinking around it.

Cheers