In a perfect world, all the guys in a group would be in similar stages of life. Single vs. married. Married no kids vs. married with young kids. Married with young kids vs. married with older kids. Etc, etc. Men in similar life stages likely deal with the same problems and more likely to bond, leading to the “What, you too? I thought I was the only” moments and connections we want to create.
That said, we realize this isn’t always possible, and so it certainly isn’t a requirement, but rather a guideline to those who can arrange it. In the case that it can’t, it’s important to pair the guys with a capable mentor who can connect the dots and keep all the guys in the group engaged and relating to each other.