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%).
Ethnic group similar gene pool. By way of language shift, acculturation, adoption and religious conversion, it is sometimes possible for individuals or groups to leave one ethnic group and become part of another (except for ethnic groups emphasizing homogeneity or racial purity as a key membership criterion). Ethnicity is often used synonymously with terms such as nation or people. In English, it can also have the connotation of something exotic (cf. "ethnic restaurant", etc.), generally related to cultures of more recent immigrants, who arrived after the dominant population of an area was established. The largest ethnic groups in modern times comprise hundreds