Physicals, eye exams, mammograms and prostate exams are the last things on their young minds. Should an illness or injury occur, young adults have a stronger, more intact immune system that generally enables them to recover more quickly than would older adults. In other words, the physical endurance of a young person is far superior to that of a middle aged or senior adult. In addition to peak physical health, young adults have the advantage of sharper mental health. Young minds are generally more alert than their aged counterparts.
Young minds have a better capability of learning and retaining information.
Above all, young people have the advantage of time. They have time to be naive. Mistakes or errors in judgment can be made with little consequence. The blunders they make will not render great consequences because at this point of their lives they do not have a lot to lose. I believe that this luxury of having time to make errors and learn from them is the most significant advantage that young adults hold over their elders.