Even demographics are working against the middle class family, as the odds of having a weak elderly parent — and all the attendant need for physical and financial assistance — have jumped eightfold in just one generation.

【参考译文】：甚至人口统计状况也对中产阶层家庭不利，因为有一个体弱、年迈的父（母）亲——以及由此而产生的所有物资和经济援助——的可能性就在十几年内增长了8倍。