What would make young people travel so many miles away from the comfort of their homes to a strange land, to leave and work among strange people? The drastic change of food, clothing, language barrier, none of these can make them change their minds.
What drives an elderly person to gather up a fraction of his or her life savings to journey tirelessly to a strange land? Once they arrive at their destination they quickly roll up their sleeves and work hard, tirelessly, the weather conditions notwithstanding.
Come to think of it.