The country has maintained steady low birth rate as local people have been aware of benefits of small-scale families, Giang Thanh Long, IPPM director.
The country's population is expected to reach 110 million people by mid-century, said Long.
The expert said Vietnam has stepped into aging process and will soon become a country with an aging population.
The "golden population structure" offers opportunity of huge labor force but also brings about challenge on improving personnel quality, creating high-productivity and high-income jobs, said Long.

According to the latest figure by the General Statistics Office, Vietnam's average population in 2016 was estimated at 92.7 million people, up 1.08 percent compared to 2015.
Just 15 years ago, only 24.6 percent of its population lived in cities, with nearly 70 percent of the labor force in rural agriculture. Today, about 32 million people live in urban areas, accounting for approximately 34.1 percent of the population.
Vietnam is also faced with a huge gender imbalance, which in the longer term means between 2.3 and 4.3 million could have difficulties finding a female partner by 2050, according to population experts.
The ratio has been on a steady rise in recent years, running as high as 112 boys to 100 girls in 2015. In the countryside, the ratio can run much higher. Globally, the sex ratio at birth is estimated at 107 boys to 100 girls.