While it is desirable for people to have as healthy a lifestyle as possible, EVERYBODY who has a disability is equally deserving of the care and help that they need. The concept of the 'deserving disabled' and 'undeserving disabled' is even worse than the old concept of the 'deserving poor' and 'undeserving poor'.
And those who have the healthiest lifestyles are the most likely to end up in the category of those who are disabled as a result of extreme old age.
The reason why more people need carers than in the past is not because people are less healthy at the same age, but because more people live to be old. I am NOT suggesting that we all drop dead at 69 (the average life expectancy when the NHS was set up) to reverse this!!!! But we also should not blame people for their health problems, and 'punish' them by denying care.
What is needed and has already started to happen is for more medical research and expertise to be put into preventing and curing, not just fatal diseases, but those that cause chronic ill-health and disability. There have recently been some promising developments with regard to at least slowing down dementia, though a lot more needs to be done,