Getting old is a natural process that nobody really likes. When you reach a certain age, your physical conditions will inevitably deteriorate, and you may suffer from various kinds of diseases. When you retire, you will feel isolated because your previous work contacts may be all gone, then you may feel useless to the world. Furthermore, when you get too old, you’ll have to rely heavily on the support from others, either physically or emotionally, and your life will become a great pressure to your family and the whole society as well.