In this study, leachate samples were collected from several municipal solid waste landfills according to landfill age(less and more than 15 years), and the concentration and characteristics of microplastics (MPs) in leachate were analyzed. In addition, the correlation between leachate water quality parameters and MPs concentration was confirmed to understandthe fate and distribution of MPs in leachate. Consequently, MPs were not detected in leachate from landfills less than15 years old, and N.D ~ 1.25 MPs/L were detected in leachate from landfills older than 15 years. In addition, the ratioof MPs less than 500 μm in leachate increased with increasing landfill age. This appeared to decrease in size owing tothe aging and decomposition of MPs in the landfill. Overall, as the landfill age increased, the MPs concentration increasedand size decreased, but no significant changes were observed. Besides, among leachate water quality parameters, pH, totalorganic carbon, and suspended solids showed a strong correlation with MPs concentration. Although leachate has been reported as a direct source of MPs to the aquatic environment, research on the occurrence,characteristics, and fate of MPs present in leachate is limited. Therefore, further research is required to understand thelimited elements to control and alleviate MPs in leachate.