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Vision, cognitive processing, reaction speed, and physical range of motion can deteriorate with age for some people. A formal reassessment creates a structured opportunity to detect impairments that may not be obvious to the driver, family, or licensing authority until after a crash or near miss.
Many licensing systems rely heavily on paperwork, self-disclosure, or infrequent medical review. Because some drivers may lack insight into their own decline, and families or physicians may hesitate to intervene, a mandatory checkpoint can function as a backstop.
Road safety policy often accepts burdens such as testing, insurance, and equipment rules because the downside risk includes serious injury or death to third parties. If retesting prevents a nontrivial number of high-severity incidents, the social benefit could outweigh the inconvenience imposed on drivers who pass.
Regulators need workable rules. A specified age trigger is easier to communicate and implement than a system that depends entirely on subjective referrals, which may be inconsistent and influenced by family dynamics, physician reluctance, or unequal access to evaluation.