As people get older, their driving patterns change. Retirement, different schedules, and new activities affect when and where they drive. Most older adults drive safely because they have a lot of experience behind the wheel. But when they are involved in crashes, they are often hurt more seriously than younger drivers. Age-related declines in vision, hearing, and other abilities, as well as certain health conditions and medications, can affect driving skills.
via NIHSeniorHealth: Older Drivers – How Aging Affects Driving.