Drop the media hype about "age personas" and you'll see that document verification behavior is not an age issue, but a matter of practical risks.
What concretely changes for a family with children is much heavier than for a single person, regardless of age, because the financial and time stakes are higher.
A young parent of 30 with two children will ensure passports are valid six months in advance to avoid a logistical disaster and unexpected costs, proving that age does not dictate behavior.
The idea that age is the main driver ignores real constraints and responsibilities weighing on people.
In Belgium, we do not check our papers because we fit into an age category, but because we anticipate administrative hassles and costs of an unforeseen event.