There is no age limit to driving a car in the UK. If you are a driver when you reach the age of 70 you must tell the Driver and Vehicle Licensing Agency (DVLA), that you have no serious medical condition which may prevent you from driving safely. You will then receive a new driving license every three years, as long as you do not have such a medical condition. This process is free.
As a license holder you must inform the DVLA if you are diagnosed with any medical condition that may prevent you from driving safely. This includes dementia .
You can get specially adapted cars to help you drive if you have certain conditions, such as arthritis or have had a stroke.
You must have motor insurance. This can be difficult and expensive for older people. You can get advice and support on insurance.