Should drivers over 70 be required to take a test every 3 years?

I saw part of a discussion on TV on this subject so what do you think?

Really, it's drivers aged 17 to 24 who're most likely to have a crash and from what I've read it seems drivers over 80 are more likely to cause themselves an injury than other people.

Drivers have to renew their driving licence at 70 and then have to renew it every 3 years but a test as well?