<prompt> Translate the following text to EnglishMapato ya usalama wa kijamii kwa tano ya juu inaweza kuwa chini kuliko kwa tano ya awali kwa sababu, miongoni mwa sababu nyingine zinazowezekana, baadhi ya wafanyakazi wazee au wenzi wao wanaweza kuwa bado hawajapata faida.  <response>: Social Security income for the highest fifth may be lower than for the previous fifth because, among other possible reasons, some elderly workers or their spouses may not yet be collecting benefits. 