@yishan Many of those "retired" people still had jobs (even if part time) and a good number of the rest helped with child care. Take out the child care and you take out a worker even if perfectly healthy.
@义山许多“退休”的人仍然有工作（即使是兼职），其余的很多人帮助照顾孩子。即使非常健康，你也可以让一个工人去照顾孩子。