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The paper attempts to study the publication trend of research articles of the Indian Institutes of Technology – IITs, the elite institutions of India established during 1950-60s (more than 50 years old) and continued to play a leading role in extending quality education and pioneering innovative research in science, engineering and technology almost up to the end of 20th century till new institutions added to this brand. The study intends to measure and analyze the research outputs of the older IITs on the basis of the research articles indexed in Web of Science during last 50 years (1970-2019) with other relevant issues. The result reflects that 5 older IITs together contributed 127481 publications as research output in different types of documents during last 50 years (1970-2019), out of which 116713 were published in the form of articles out of which IIT Kharagpur published maximum number of research articles (IIT Kharagpur published 26688 articles - 22.87%) but while counting the productivity for the blocks of every five years, different IITs achieved highest ranking in different block years. The citation impact, collaboration with national and international institutions, prolific authorship and productive subject areas of research among the institutions found competitive and progressive.