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%).
Environment of Indonesia rates, rising sea levels will result in 42 million Indonesian households over 2000 islands being at risk of submersion by the middle of this century. Over 60% of Indonesia’s population live in low-lying coastal areas, including Jakarta, which is particularly at risk, as 40% of the city is below sea-level and is rapidly subsiding, putting a huge number of people at risk of displacement. All of this is likely to affect poorer communities the most. Over 50% of the population of Indonesia live on less than US$2 per day, and the poor will bear the brunt of the disastrous effects