Who benefits from such simplification? The idea that segmentation by age directly manifests in document verification behavior is an overly simplistic generalization that ignores the true motivations.
It's not age itself that dictates anticipation, but much more the responsibilities and life situation.
A thirty-year-old parent with young children will ensure passports are ready months in advance, whereas a single septuagenarian, without these constraints, might be less diligent.
The true determinant factor is often mental load and the consequences of forgetting, not the date of birth.