Your health history not only affects the cost of long term care insurance, it also may determine your eligibility for coverage. A person with chronic health problems poses a greater risk of needing long term care services sooner rather than later and, therefore, will likely pay a higher premium for coverage than does a person who is in good health. Also, if you have a pre-existing condition such as heart disease or diabetes, long term care insurance may not be available, but if you find a policy that does cover pre-existing conditions, your premiums may be higher than for a person without any pre-existing condition.
Although not a factor in determining the amount of coverage you should have, you should seriously consider purchasing inflation protection to account for the rising cost of health care.