as melissa chan reports from beijing, that has left a lot of people hoping that they don't fall ill.reporter: every morning these residents in their 70s and 80s practice tai chi in the park. the exercise helps maintain health and longevity. for their age, they are in excellent health, but their age group also sees the most hospital visits, something they can ill afford. if you don't have money, you don't have any choice.$ñ(q if you don't have money, you don't go see the doctor. i haven't, we haven't had to spend tens of thousands of dollars. >> but that's just what you need in china tens of thousands of dollars when things go wrong. china once had universal health care, but the changes that create a market economy also saw the introduction of a multi-tiered and highly confusing health system. a decentralized, partly privatized, sometimes government subsidized frankenstein. it's very difficult to keep track of over a billion people's situations, but what information we have suggests the majority of chinese have no choice, but to pay entirely out of pocket for doctors and hospitals. >>