木有hints~
life expectancy unprecedented groundbreaking is are not carved in stone impractical unrealistic reflection nostalgic empty-nest syndrome midlife crisis confused bewildered puzzled disoriented mindset maturity dynamic linger in one's mind
life expectancy 人均壽命 unprecedented/ groundbreaking 史無前例的 is are not carved in stone 并非一成不變 impractical/unrealistic 不實(shí)際的 reflection 沉思 nostalgic 懷舊的 empty-nest syndrome 空巢綜合癥 midlife crisis中年危機(jī) confused/bewildered/puzzled 困惑的 disoriented 迷失方向的 mindset 心態(tài) maturity 成熟的 dynamic 有活力的 linger in one's mind 揮之不去