Our neighbor is 94 and has poor eyesight and hearing. It absolutely horrifies us that she still drives. We regularly inspect her care for dents and scrapes or, heaven forbid, blood and other evidence that she has clipped a person. There is a new scrape on there every few weeks. She is going to kill someone one of these days - it is just a matter of time.
We can all thank the AARP for allowing her and others like her to stay on the roads. It is the AARP, with its deceptive statistics, that lobbies state legislatures to not mandate testing above age 70 and so forth. The main stat they use is the overall risk of a senior being in an accident versus persons from other age groups. The pitfall here is that seniors do not drive nearly as many miles as those of us who work, etc. Also, they lump in persons between 55 and 70 with those who are 70+. Those are dramatically different age groups in terms of their driving skills.
The fact is that on an accident rate per mile driven basis, 70+ drivers have a massively higher accident rate. This would be even higher were it not for the fact that accidents caused by seniors tend to be underreported because the attending officer does not want to be the one who 'took granny's keys from her'. I have seen this actually happen with an aunt.