I think one has to define elderly in that case.
The americans call them seniors and by that they mean anyone over 65 so me included. A good definition for elderly as well.
Something much more relevant to this thread and access to GP medical records, my wife, as a member of her practice Patient Participation Group, something I would recommend to everyone, was asked to visit the two surgeries and speak to patients in the 2 waiting rooms to get some insight into why there hasn't been a better uptake of making use of the online facilities. The two surgeries are different in that one has largely retired, middle class patients while the other has more patients from overseas.
She managed to speak to over 100 patients in one surgery during a whole day, a lot of them retired, a lot of them owned computers but when asked if they would make use of the online facilities like making appointments, getting repeat prescriptions, they practically all said that they only use their computers for eMail, some said they used Skype, some even did online shopping but would not consider using the surgery's online facilities.
I even have friends, so people in their 60s, who are proud of not being able to use a computer. Unlike their children who have been brought up using PCs since their school days, some of us seniors just don't use computers or only use some of their capabilities.