示范答案：
Well, first I have to say that there are many differences. The older people are more likely to shop at the open-air markets. They are passionate about buying stuff on sale or bargaining with street vendors for lower prices, while young people prefer to shop at shopping malls. As for the reason, I guess it is a natural result of the fact that they were born and grew up in different times. Elderly people and young guys have totally different values. Consequently, it is quite understandable.
