Can you live on campus at 23?

Generally, no, you cannot live in most university on-campus housing at age 23. Most universities' on-campus housing is primarily for undergraduate students, and even graduate student housing often has age restrictions or prioritizes younger students. The age limit is usually around 24, but it varies by institution and housing type. There might be very limited exceptions, such as specific programs for older, non-traditional students, but these are rare.