They train you on this. And to answre your question: No. The same rules apply as any normal driver's license.

Always use the age calculator if you're not certain. Don't worry all the 1900 b-days clear. If it's 1996-2000 I enter them. If I see a horizontal license I just ask them to scan it. Better safe than sorry. If they are not of age you can refuse sale. If you're in doubt in any way refuse sale. Your job is more important than some karen getting drunk and being a di-ck about it.