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In page Demographics of Indonesia:

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Indonesia has a relatively young population compared to Western nations, though it is aging as the country's birth rate has slowed and its life expectancy has increased. The median age was 30.2 years in 2017.[7] Indonesia includes numerous ethnic, cultural and linguistic groups, some of which are related to each other. Since independence, Indonesian is the language of most written communication, education, government, and business. Many local ethnic languages are the first language of most Indonesians and are still important.[citation needed] Examples of local languages being Balinese, Gayo, and Taeʼ.