It's not necessarily this bad in terms of standard of living (the above description would be subsistence levels, maybe less than 200$ a year), but the median household income in China is about $12-15k US a year compared to $56k in the US. And it's not that in China everything is cheaper so 12-15k goes a long way - no, they just live with less. Things that we take for granted, like insurance, available hospitals, quality goods, good customer service, safety of food & goods (a big one we don't even notice) - these are the result of a developed economy, and we definitely pay for it - we (as an economic whole) have the additional income to allow for these things to exist.
Even with a 10% GDP increase per year, it would take China another 15 years to get to US level standard of living. With a 5% GDP growth, it would take 30 years. These are just numbers to me (12k vs 50k living, I can see one is 4 times better!), but my parents know firsthand what the difference feels like and it makes their urgency much stronger.
For reference, I think my grandparents would be living on an equivalent of around $2-3000 a year based on what I know my mom gives them (and maybe other family members).