A “gap year” between high school and university is a pretty common experience throughout the world, and for a lot of people lucky enough to arrange it, it may be the best time of their life to travel. However, many high school graduates are 18 or 19, and around the world, that can make certain travel experiences a hassle.Even with extensive planning and research before your departure, traveling as an 18-year-old may come with some surprises. Did you know that many hotels around the world require that you are at least 21 years old to register and check in? It’s also common for rental car companies to require that you’re at least 21 (and sometimes 25) to rent a car – but travelers can get around that by using public transport or ride-share services.