Our Vision Zero goal aims to drive down death and injury on our roads and to protect all road users. Sadly, we know that older Londoners can be more at risk of injury on the roads. In my response I have interpreted your question to mean what proportion of car collisions involved a car driver aged 70 years or over.
The below table shows the proportion of collisions involving a driver aged 70 years or older from 2015 to the end of May 2020, which is the latest information available. Please note that multiple vehicles may be involved in each collision and that some vehicles may not be in direct conflict with person injured. The figures for 2020 are provisional and subject to change. Finalised figures will be published in the ‘Casualties in Greater London during 2020’ factsheet in spring 2021, which is in line with the Department for Transport publication timescale for the national dataset.
Personal injury collisions involving a car, 2015 to end May 2020 (provisional) - GLA Area