It amazes me that under the UK law (or at least is socially acceptable by some), it is OK to starve someone leading to a slow horrible death. However, if they were to administer a high dose of a sedative so the person could die quickly and without pain or misery, the administering practitioner would be charged with murder.
Liberalism makes no sense.
I think killing anyone, young or old, with or without suffering is wrong. Giving someone food and water is not providing treatment.... Just as air to breathe, if it is withheld it constitutes murder. This is far different than withholding medical treatment, which is still wrong. Withholding comprehensive medical treatment is not wrong in some cases (my opinion), for example coronary bypass surgery on someone who has stage IV lung cancer.