I think there is a lot that is lost by society's tendency to group similar people and people's natural tendency to seek out those who are similar to each other. When all the elderly people get put in retirement homes think of what is lost by those who could have benefited from the elderly person's years of experience and wisdom.
If you want to be a better entrepreneur, you are probably going to find an older entrepreneur who has some experience to teach you something, not one in your peers. Well, if you constantly surround yourself with those similar to you, how are you going to be challenged to grow as a person?