To find out if your graphics card is compatible with DirectX 11, visit the Windows 7 Compatibility Center. To learn more about DirectX 11 and check compatibility visit, http://windows.microsoft.com/en-us/windows7/products/fe...
Gamblers in California must be a minimum of 18 years old. If however, alcohol is served there, the age is 21 and beyond. Also check out this site: California Casinos which has a clean interface and pulls information from various sources.
On the other hand, if your state will allow 18 year olds but that particular gambling site requires you to be 21, you will have to be 21 - regardless of your state's requirements. This is the only real point of confusion, and it can be easily bypassed.