Just before I was 70 I applied for my new drivers licence with all categories still on it. I paid the doctor £90 for a DVLA form and then had to fill out two further forms and was asked to go for a treadmill test at the local hospital. I gave up and just asked for a renewal with fewer categories.
I have recently found this out from a cousin that hit 70 this year. So strange that if you only renew 1 category it is a straight forward renewal but if you want 2 or more it is medical etc. I get there next year.