Southeast Asia is aging – and rather quickly. In Vietnam, the number of 0-14 year-olds will decrease by 3.7 million between now and 2050. In Thailand, it will fall from 10.7 million to 7.8 million. In Indonesia, from 69.9 million to 61.6 million. In Myanmar, from 13.2 million to 11.5 million. In real terms, the number of younger people will only grow in the Philippines (from 34.7 million to 36.4 million), although as a percentage of the population, it will fall from around 30 to 23 percent. See the chart below for the percentage of the population that will be aged 0-14 at different…