Approximations

I came to the result by approximations.

According to Stewart, the Chinese also have a special reverence for the number seven. They believe that many stages of their lives are related to that number, he explains. People get their baby teeth when they're seven months old, their adult teeth when they're seven years old, go through puberty when they're 14, which is 2 times 7, women go through menopause when they're 49, which is 7 times 7. Stewart says people find these patterns significant because they suggest, in one sense, a grand plan. Clearly, he notes, these ages aren't exact, women don't always go through menopause at 49, but they're very close approximations. And the number seven keeps coming up.