Reports The Denver Post:
Using a "low growth" model of 2 percent per year for the next century, Koltko-Rivera calculates that Mormons will number more than 21 million worldwide by 2030 and more than 125 million by 2120.
Yet Koltko-Rivera argues that the "high growth" model of sustained annual growth of 5.5 percent is more likely, putting the global Mormon population at more than 24 million by 2030 and 2.6 billion by 2120.
Even many LDS faithful have trouble swallowing that figure.
His projections were made before the church decided to allow young men to go on missions at 18 instead of 19. Young women, who make up a little more than half the new applications, can now go at age 19, rather than waiting until they're 21. Women previously had made of only a fifth of the 58,000-strong missionary force across the world.