ARTnews has compiled its annual list of the world’s top art collectors. “When do you become a serious collector who might make the Top Ten, and how long do you remain one? It kicks in at about the age of 45. Of course, you’ve got to be extremely wealthy. Usually, you’re not willing to spend lots of money on art unless you reach that age and you have the confidence to do it. It lasts for about eight to ten years.”