8) Prasert Prasarttong-Osoth (Net worth: $2.6 billion)
This 82-year-old self-made billionaire is the founder of Bangkok Dusit Medical Services, the largest private healthcare group in Thailand.
The group operates 35 hospitals in Thailand and two hospitals in Cambodia. In November, Prasert Prasarttong-Osoth raised $395 million by listing his regional airline Bangkok Airways.
7) Vanich Chaiyawan (Net worth: $3.8 billion)
Vanich Chaiyawan is a self-made billionaire who made his fortune in insurance and beverages.
This 83-year-old businessman is the chairman of Thai Life, Thailand’s second-largest life insurance company. Vanich Chaiyawan has 60 percent stake in Thai Life.