The statistics don't quite bear flip-flop out but close
When you adjust for the miles a year they drive and you adjust for the population of that agegroup holding a licence what you actually find is the most risky groups are women over 70
These are closely followed by men under 20
Men over 70 are actually pretty good - better than all groups of men and women under 40.
In fact women in this age group are 4 times more risky than the men
Of course retired people tend to drive less which is why they tend to be involved in less overall accidents as a fraction of the population.
The data comes from this report which was 1996 and 7 but I doubt there's been much change
http://www.dft.gov.uk/stellent/groups/dft_mobi lity/documents/page/dft_mobility_030414-03.hcs p