What is the most stupid thing you've seen another driver do . . . .

[Robbie8666]

There should really be a cut off point for elderly drivers.

I thought that at 70 years old, drivers had to undertake a medical to retain licence?

just googled it and this is what Direct line have on their website

There is no legal age at which you have to stop driving, so whether you renew your licence is totally up to the individual. It is your responsibility to decide whether you are still fit enough to drive. By law, you have to renew your licence when you reach the age of 70, and then every three years after that.
Ninety days before your 70[sup]th[/sup] birthday, the DVLA should send you a D46P Application for renewal of a driving licence. You can either fill this in and return it by post, or you can use the DVLA's online service to renew. There is no fee for renewal.
If you have a C1 or D1 entitlement – for minibuses or towing vehicles – and you intend to renew this as well, you must enclose a D4 'medical examination report' completed by a doctor in support of your application.