retirement[退休]

  -eg: retirement home[养老院],

  retirement age[退休年龄];

  retirement pension[退休金];

  demographic[人口统计学的]

  -eg: demographic structure[人口结构],

  demographic census[人口普查];

  graying/aging population[人口老龄化];

  senior[年长/资深的]

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