The theory is that such drivers would previously have been let off with a warning, at the "discretion" of police officers.
Rob Gifford, director of the Parliamentary Advisory Council for Transport Safety, said that older drivers had been accustomed to driving on roads without cameras and would have found it harder to adapt when they spread across the country.
“Police may have given elderly drivers a telling-off rather than a fine whereas cameras are blind to the age of the driver,” he said. “It was wrong to be lenient with older drivers because they were posing a danger on the roads by ignoring the limit. Since the growth in cameras, the proportion of vehicles breaking the 30mph limit has fallen from 75 per cent to 30 per cent and deaths have fallen sharply.”
Mr Gifford said that the rise in older speeding offenders helped to explain the emergence of a vociferous anticamera campaign dominated by drivers in their fifties and sixties.