From Dries,

Eighteen years is also the voting age in the US, and the legal drinking age in Europe. I'm not sure which one is better. :)

The video is a who's who of companies which is always amazing given the roots and efforts of all the open source CMS. Well done Drupal! Also, thank you for not mentioning whitehouse.gov (yes I know not on Drupal anymore but for years that's all I could remember about Drupal).