It's not really a recognized life milestone, but growing up through the Satanic Panic as I did, I'd like to take a minute to say, my son is running his first home-made D&D campaign with his friends today, and I'm proud of him.
What our parents were told D&D was about: Satanism, blood rituals, animal and occasionally human sacrifice.
What D&D actually is: Cooperative storytelling, stand up comedy, group therapy and first-year applied statistics.