Thailand Board of Investments (BOI): Demographics, haettu 19.12.2007 The population of Thailand was estimated at 65,068,149 in July 2007. Approximately 25 percent are under the age of 15. This core population includes the central Thai (36% of the population), Thai-Lao (32%), northern Thai (8%), and southern Thai (8%). The population growth rate is 0.68% (2007 est.) Life Expectancy at Birth total population: 72.55 years, male: 70.24 years, female: 74.98 years (2007 est.)