The image below is a schematic flow diagram of a typical oil refinery that depicts the various unit processes and the flow of intermediate product streams that occurs between the inlet crude oil feedstock and the final end products.
In order to check-in into a hotel, the person must be 21 years old.  If the person is younger than 21, then a parent or guardian can  give permission for them to check-in. 1 person found this useful.
You can really get into a casino/ hotel at any age but you have to be 18 years old on a cruse and 21 to actually gamble. Depends, Some casinos ID you and you have to be 21, and then there are some to where you only have to be 18, but cant gamble. It varies by state.