While income worry is _____ rather commen problem of the aged,loneliness is another problem that _____aged parents may face.请填入适当的冠词(或者根据需要不填),并说明理由!

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While income worry is _____ rather commen problem of the aged,loneliness is another problem that _____aged parents may face.
请填入适当的冠词(或者根据需要不填),并说明理由!

a 一个普遍存在于老年人群的问题
不填 泛指上了年纪的父母,不是特指某一对父母