Actually in my experience most young people don't travel as much internationally because many can't afford it or are busy with school or paying student loans off and pay rent or mortgage etc unless of course someone else finances their trips and their nice life style. Most people travel internationally when they are a bit older or if they have lucrative careers at young age, which isn't always the case. So I wouldn't worry about everyone goes overseas in young age. Many young people don't as it's very expensive. They still enjoy their life. So i wouldn't worry about it.