Interestingly, they also give their young a chance to leave temporarily, known as the Rumspringa, and then decide whether they'd like to return and live as Amis

Interestingly, they also give their young a chance to leave temporarily, known as the Rumspringa, and then decide whether they'd like to return and live as Amish or stay in modern society (with the ability to still visit if they'd like). A few decades ago they retained 75% of their children. Now it's closer to 90% which probably tells you something.