Costs of nearly everything has gone down since the 'good old days' as compared to a percentage of income. The car went from a commodity used only by the super wealthy, to a method of transportation for all. Free markets and innovation drove costs down and quality up.
Why should medical care be any different?
Maybe medical technology is not stagnant, consider that possibility?
What is the price of new technology? Negligible?
Medical care is very, very different, which is a good thing if you need help assessing the difference.