You can buy anything. If you're a hundred years old you can buy a student ID card that includes your picture. The road is popular with Thai students seeking out westerners and Asian travelers to absorb their cultures. Many use the opportunity to practice their English. Japanese travelers are quite popular since many Thai teens emulate them.
Accommodations are cheap.
Rooms with a fan and a private bath are available for 200 baht. More elaborate accommodations are obtainable in the area, which include air conditioning and cable television. Western food can be pricy but if you eat Thai you can get by on the cheap and eat well. Since Khao San Road functions somewhat like a hub for tourists traveling to and from their native countries, Cambodia, Vietnam, Laos the travel agents get a lot of play. There are tons of them.