Single parents with children aged between 5 and 11 will also be forced to attend work-focused interviews.

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Next up, his aides say, will be a set of interviews focused on sports and entertainment topics.

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The study, authored by four academics at Duke University, focused on older workers, aged 51 to 75, and tracked more than 13, 000 people through interviews every other year, from 1992 to 2010.

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