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.
that is not always true, it depends on the place, most will say 18 but you need a credit card to hold the room. Hotels can be shady on renting a hotel room to an 18 year old, because they always think they are going to fuck up the place. Fucking up a hotel room seems like a good idea at the time, until they charge your credit card or send you a bill. My suggestion is to call a couple of places and find out how old you need to be.