Retro works best when the memory stays clearer than the effect.
A retro photograph does not need to imitate one exact decade. The useful clues are more familiar: modest color separation, highlights that do not feel clinical, blacks that have softened with time, and warmth that resembles a small print kept in a drawer.
Instant Fade is the starting point here because it changes the emotional temperature without covering the subject. Compare it with Expired Color when you want stranger color, or Pocket Flash when the frame needs the blunt energy of a compact camera.