Huh? An aging population is actually one of the things that will force it. More retirees will take more of the surplus from the productive population and reduce the surplus left for export.
Speaking of fixed incomes, these retirees are dependent on risky investments like real estate (collapsing) and public pension schemes (about to collapse). On top of this, retirees aren’t generally the consumers of the supply chain components that China makes. Remember, they never moved up the value chain of sophisticated goods manufacturing. They got too expensive before that.