In a few short years, I'll be a member of the geriatric tribe, complaining about rights for senior citizens and age discrimination along with everyone else. But there is such a thing as common sense. Older drivers are more inclined to suffer hearing loss. Reflex reactions tend to wane among the elderly. As folks age, the capacity for night-time vision diminishes.
Physical restrictions increase with age, such as neck rotation and peripheral vision.
The cold hard fact remains, physical restrictions or senility will set in with some folks a lot faster than others. No two people age alike. I'm sure most seniors are infinitely aware of these problems. At present, we have 16.3 million people in the U.S. over the age of 75, and their numbers will double by the year 2030. Cars are highly dangerous instruments which account for 42,000 deaths a year, not to mention another three million non-fatal injuries.