随着人口的老龄化，人们也从寒冷的铁锈地带（指美国传统工业衰退的地区）转向舒适的阳光地带（指美国南部）。
As the population aged, there was also a shift from the cold Rust Belt to the comforts of the Sun Belt.
美国和英国人口的老龄化将不可避免的引发一些成本。
The greying of the American and British populations will inevitably involve some costs.
至于家庭，经济学家说，人口的老龄化将产生巨大的影响。
As for households, the economists say that the aging of the population will have a big effect.
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