كه این بیانگر وقوع سالخوردگی جمعیت در آن است

Question

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جمعیت سالمندان ایران براساس آخرین سر شماری، حدود 2/8 درصد کل جمعیت کشور را شامل می شود كه این بیانگر وقوع سالخوردگی جمعیت در آن است .

Answer 1

Iran's elderly population , as per the last conducted census , consists of about / approximately 8.2 percent of the country's whole population showing / revealing / being the indicative of / sign of population aging / senectitude occurance in it.

be indicative of sth
to be a clear sign that a particular situation exists or that something is likely to be true
This behaviour is indicative of her whole attitude, I'm afraid. (Webster)
 

Answer 2

According to the last census, Iran's elderly population covers 2.8% of the whole, indicating an ageing populations or that the population is ageing.