95%. McGrath of Harlow.
That's what I put because that is the answer.
Huge difference between access and day to day usage.
I once dealt with a complaint sent via email that their lack of access to IT meant they were being sidelined.
The Care Quality Commission and OFSTED reckon that to be the figure, to include those in care having access via advocate. If you wish to look it up, it is under safeguarding.
Now... That is a stab in the dark but methinks a bit more accurate than your 60% which is, forgive me if I am wrong, the population with daily access according to industry figures.
My wife's grandad is 94 and never used a computer in his life, but his annual entry on the register of voters is done via a computer, by his daughter with his blessing. etc etc etc.