It is nearly impossible for anyone under 18 to rent a hotel room in Pennsylvania or anywhere in the United States, according to USA Today. Most hotels set age restrictions because minors under 18 years of age cannot sign legally binding contracts, including a hotel room rental agreement.
Another legal consideration for hotels is the liability of having unsupervised minors on site, which is a risk most hotels do not choose to take, notes USA Today. One possible work-around would be for the minor to obtain a notarized letter of permission signed by one or both of the minor's parents to be presented to the hotel upon check-in. This only works on a case-by-case basis at the discretion of the individual hotel, so this must be planned and approved in advance with the hotel prior to arrival.