I'm afraid, Lottie, research work in the States and Australia suggests anything but your proposition. I am trying to find the UK numbers but I quote from one source. SmartMotorist.com:
"In the next 20 years the number of elderly drivers (persons 70 & over) is predicted to triple in the United States. As age increases, older drivers generally become more conservative on the road. Many mature drivers modify their driving habits (for instance to avoid busy highways or night-time driving) to match their declining capabilities. However, statistics show that older drivers are more likely than younger ones to be involved in multi-vehicle crashes, particularly at intersections.
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Research on age-related driving concerns has shown that at around the age of 65 drivers face an increased risk of being involved in a vehicle crash. After the age of 75, the risk of driver fatality increases sharply, because older drivers are more vulnerable to both crash-related injury and death. Three behavioral factors in particular may contribute to these statistics: poor judgement in making left-hand turns; drifting within the traffic lane; and decreased ability to change behavior in response to an unexpected or rapidly changing situation.
Concern about the increased number of older drivers and their potentially decreased driving abilities is growing, especially among younger drivers. Statistics, based on all people injured or killed in traffic crashes, indicate that older drivers are at a disproportionate risk for becoming involved in fatal crashes. A NHTSA study of 1995 FARS (Fatal Accident Reporting System) data reports that senior citizens accounted for:
5% of all people injured in traffic crashes
13% of all traffic fatalities
13% of all vehicle occupant fatalities
18% of all pedestrian fatalities
In a 1997 NHTSA study, older people made up 9 percent of the population but accounted for 14 percent of all traffic fatalities and 17 percent of all pedestrian fatalities."