Movement speed is one of two key components of driving, with the other being reaction time. Numerous studies show that the result of normal aging is a decrease in reaction time. One study found that when presented with a situation in which multiple variables were to be accounted for, elderly people consistently took longer than 2 seconds to respond. (https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4940374/). Another point proven by studies is that elderly people are at risk of many different conditions that lead to visual impairment, such as cataracts and Diabetic Retinopathy. These statistics aren’t just something that “would likely” lead to more accidents, they are proven to lead to more accidents. Older drivers have more accidents per mile driven than any other age group (https://www.ncbi.nlm.nih.gov/pubmed/1930757).
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