en مددکاری Social work نامه به سردبير Letter to Editor <div style="text-align: justify;"><span style="font-size:14px;"><span style="font-family:Tahoma;"><span style="line-height:2;">Today, with the increase in the elderly population and life expectancy, the need to use care services for this significant part of the population is increasing [1]. Beliefs, cultures, and social norms among different ethnicities and races are vital in the extent and nature of care. Two types of care exist, informal and formal. According to statistics by the Secretariat of the National Council on Aging, almost 0.2% of the elderly receive formal care. Therefore, a significant percentage of the elderly live with their families.</span><br> <br> <strong>Coresponding author:</strong>&nbsp;Kianoush Abdi,&nbsp;E-mail:&nbsp;k55abdi@yahoo.com<br> <u>You can also search for this author in:</u>&nbsp;&nbsp;<a href="https://pubmed.ncbi.nlm.nih.gov/?term=%28Kianoush+Abdi%5BAuthor%5D%29+AND+%28University+of+Social+Welfare+and+Rehabilitation+Sciences%5BAffiliation%5D%29">PubMed</a>,&nbsp;<a href="https://scholar.google.com/citations?hl=en&user=CjQks5wAAAAJ">Google Scholar</a></span></span></div> Elder, Sandwich generation, Difinition 379 380 http://irj.uswr.ac.ir/browse.php?a_code=A-10-51-6&slc_lang=en&sid=1 Hakime Pashazade pashazade.h1994@gmail.com 0000-0001-9305-4523 No Department of Social Work, University of Social Welfare and Rehabilitation Sciences, Tehran, Iran. Masoomeh Maarefvand arammaref@gmail.com 0000-0001-9057-9252 No Department of Social Work, University of Social Welfare and Rehabilitation Sciences, Tehran, Iran. Yadollah Abolfathi Momtaz yabolfathi@gmail.com 0000-0002-5367-5672 No Iranian Research Center on Aging, University of Social Welfare and Rehabilitation Sciences, Tehran, Iran. Kianoush Abdi k55abdi@yahoo.com 0000-0002-9231-5338 Yes Department of Rehabilitation Management, University of Social Welfare and Rehabilitation Sciences, Tehran, Iran.