This segmentation by age, location, gender, health status, etc, are all schemes designed by insurers to lower the price of their product for one segment at the expense of another. Insurance is about sharing risk, and segmenting by age (or other factors) does just the opposite. It effectively allows the insurer to push the higher risk users out of the group. This favors the insurers, not the individually insured.
As someone who worked in the actuarial field for 23 years, specializing in personal auto insurance, I have to take some exception to this, especially the use of the word "scheme."
A general principle of insurance is to properly rate each risk as best as possible as to avoid having non-homogeneous risks in the same group of risks. Doing so ends up having lower rated risks subsidizing higher rated risks.
For example, in personal auto, we try to group the more urban risks together while grouping the suburban risks together and the rural risks together. Combining non-homogeneous risks by rating territory together ends up having the lower-rated rural risks too high, subsidizing the urban risks.
This is why insurance companies charges drivers under age 25 more while charging older drivers (mainly those between ages 25 and 65) less. Not doing this would force older drivers to pay more to subsidize the younger ones. These rating differentials are reviewed annually.
This is why insurance companies charge drivers with bad driving records more than drivers with good driving records. Again, not doing this would force better drivers to pay more to subsidize the lousier ones. These rating differentials are reviewed annually.
There are limits, of course, to how far this can go. Insurance companies could not charge different rates by race, even if it could be justified by the data, because it would be discriminatory. Some states do not allow different rates by gender, though many do (mainly for drivers under 30).
In the more urban areas, there is a flattening of the class rating tables so that the "double-whammy" effect of being a young driver in an urban area, for example, is lessened.
Auto insurance, like health insurance, is highly regulated by the individual states. State regulators are free to allow or to disapprove of rate changes as well as rating class differentials, and in my 23 years in the auto insurance field they did each of them all the time.
I realize that in health insurance, the ability to charge different rates for various groups of people is limited compared to auto insurance. But some rating variables are permitted, such as geography and age, and if you smoke or don't. But to call these legitimate rating distinctions "schemes" puts an unwarranted negative slant on them. They are not designed to kick people out of the insurance system.