A person who studies the characteristics of populations, such as age, race, and income.

जनसंख्या वैज्ञानिक

English Usage: The demographer analyzed the birth rates over the last decade.

Hindi Usage: जनसंख्या वैज्ञानिक ने पिछले दशक में जन्म दरों का विश्लेषण किया।