Thai couple compatibility by age

Thai almanacs contain many short formulas for couples that use nothing but the two people's ages: add them (or take the difference), multiply by 3, 12 or more, divide by 7 or 9, and read the remainder. Each “old text” looks at a different question. Here they are all together.

Translated and combined from thirteen Thai pages. Texts were condensed; references to death, violence and servants were rewritten, and the “husband and wife” inputs were made neutral, since every formula is symmetric.