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A total 400 numbers of Nemipterus japonicus were randomly collected in Tha-baw-seik landing area from 2018 January to 2018 December. After that, the samples were taken out their sagitta otoliths and scales and examined their yearly rings. Among them, 356 numbers were reliably used for age determination. In the present study, it was found that the maximum age was found 5+ years old for pooled fish with SL = 23.14 cm and the youngest one was 1+ year old for a female specimen with SL = 12.72 mm. Moreover, it could be concluded that N. japonicus has medium longevity and the highest growth length rate can be at the first and second age group. The present study will absolutely provide for further stock assessment studies in Myanmar because it was the first study about age determination of N. japonicus.