First, classify before drawing conclusions about identity document verification; age is not the determining factor as often thought.
There are two main categories influencing this behavior: situational factors and personal behavioral factors.
An unexpected business trip, or a specific visa requirement, is a situational factor that can force anyone to act at the last minute, regardless of age.
Procrastination or travel experience are more relevant personal behavioral factors than age; for example, a seasoned senior traveler may be complacent, while an inexperienced young person will be very organized.