Demographics of Indonesia local ethnic languages are the first language of most Indonesians and are still important. Indonesia demographic composition has a relatively young population. According to 2011 estimate, total median age of Indonesia is 28.2 years. Total Fertility Rate (TFR) (Wanted Fertility Rate) and Crude Birth Rate (CBR): Total fertility rate (TFR) and population over age 60 by region as of 2010: Source: "UN World Population Prospects" There are over 300 ethnic groups in Indonesia. 95% of those are of Native Indonesian ancestry. Javanese is the largest group with 100 million people (42%), followed by Sundanese who number nearly 40 million (15%).
Tay people Tay people The Tày people speak a language of the Central Tai language group, and live in northern Vietnam. They are sometimes also called Thô, T'o, Tai Tho, Ngan, Phen, Thu Lao, or Pa Di. There are about 1.7 million Tày people living in Vietnam (based on the 2009 census and 5 years of population growth). This makes them the second largest ethnic group in Vietnam after the majority Viet ethnic group. Most are in northern Vietnam in particular in the Cao Bằng, Lạng Sơn, Bắc Kạn, Thái Nguyên, and Quảng Ninh Provinces, where they live along the valleys and