Are you able to tip your head back enough to get the 'near' part of your spectacle lens to the viewfinder?
I use either the viewfinder which is "set" (diopter adjustment) to infinity or the screen which is articulated (I wouldn't ever consider a fixed screen camera) so can easily hold it at the right height to look at the screen through the D-segment (near part) of the bi-focals. I don't actually find it annoyingly out of focus when held above head (again the articulated screen is essential) even though I am looking through the distance part of my specs.
As for tipping my head (and I think Tony with you medical connections will easily understand this) I have
Ankylosing spondylitis so my neck is less than fully “articulated”. I manage.
Age: I am now well into my 81st year. I rattle with pills first thing in the morning but things mostly under control. But there don’t seem to be any pills for hearing problems. As I now realise, deafness isn’t simply a matter of things going quieter. Sounds, especially voices, are horribly distorted. Hearing aids you ask? The technology seems still to be in the Stone Age. I'm sure a Victorian ear trumpet would be just as good as digital hearing aaids.
Jack