Most people think that the biggest asset in their twenties is youth, but in fact, the greatest challenge in your twenties is uncertainty. You don't know what kind of person you will become in the future, and you don't know if the skills you are currently accumulating are truly valuable; you don't know if the person in front of you will stay with you until the end, nor do you know what kind of intimate relationship truly suits you; you don't know what kind of career, marriage, and family you want in the future, and you especially don't know where today's choices will lead you. This ongoing uncertainty about identity, relationships, and the future constitutes the most genuine source of anxiety for many people in their twenties.