My late sister who lived in Wales died last year after a very short illness. Because in Wales everyone is considered a donor, her life support was turned off and she was wheeled off to theatre where the transplant team were waiting for her to draw her last breath.
I, who live a three hour drive away wanted to visit her as I hadn't even known she was ill.
I was told I could visit and would be able to see her "afterwards"
I didn't go and she lived on, in a coma for another three days.
I felt that the whole thing was ghoulish, just waiting to take her organs.
She was 66 by the way, so doesn't seem to be an age limit.
That experience has rather turned me off being a donor, although I was a blood donor for forty years.