All of the above, plus the below, from national statistics;
Although they walk less than people in younger age groups, older people are considerably more likely to be killed, as pedestrians, in a road accident. People aged 70 and over walked on average nearly a third less far than the population as a whole in 2002. However, 3.7 per 100,000 population aged 70 and over were killed as pedestrians in road accidents, compared with a rate of 1.3 per 100,000 for the population as a whole.

So the elderly are more likely to be killed by their younger compatriots if they are making a journey out of a vehicle!