the country will be over sixty in the early part of the 21st century. It is high time that the problem was given serious and earnest attention now.
Words:
Toil
vt.
①to work very hard and/or for a long time，usually doing hard physical work (长时间)苦干
②to move slowly and with difficulty 跋涉 Eg：They toiled up the hill in the blazing sun n. hard unpleasant work that makes you very tired 苦工，苦累的工作
A life of hardship and toil艰难劳苦的一生
unprecedented adj.
that has never happened, been done or been known before空前的；前所未有的；没有先例的
Eg：The situation is unprecedented in modern times. unprecedentedly adv.
wear out：to become，or make sth become thin or no longer able to
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