There is certainly a rise in the number of recognised dementia sufferers and I would expect this to get far worse in future. Dementia can be triggered by so many things. One of them is alcohol abuse and the way so many young people in this country binge drink is leading to a lot of concern for medical professionals dealing with dementia.
dave50, most dementia sufferers are actually happy people, as they don't realise they have a dementia. Some of course are not. It is often far harder on the relatives than on the person with the dementia. So, I cannot see that it would be acceptable to deny these people medication that helps them live a positive life. My mother has dementia, is 95, is no longer mobile. She is happy with her life and always says she doesn't want to go yet. The only medication she takes are occasional pain killers to help with her osteoarthritis and medication against constipation. To me, she has every right to be here for as long as SHE chooses! There is nothing wrong with getting old and nothing wrong with receiving medication to make this process easier. I think we also must not forget that we owe our elderly a safe and good life. It is they who have prepared the way for us and to then have them denied the life they want would be totally wrong.
On the other hand, there are certainly people who are kept alive when perhaps it would be best to let them go. This has nothing to do with age though! This has more to do with terminal illnesses that have become unbearable. Doctors do often decide to stop medication that is prolonging a person's life, as it is no longer tenable and no longer the best thing for the patient. I had to make the decision to stop the medication that was keeping my son alive and it was the hardest and worst thing I have ever had to do. But it was the right decision for him ... not for me ... but, for him! no, perhaps that is not quite correct .. it was the right thing for me too as I was able to stop his pain.