Just go along with it. Because you have to, the story says so.
You are approached by an omnipotent being, who tells you that you, and only you, must make a decision. You must choose a specific group of people, using categorization of your choosing, except age. All of these people will instantly die, with no mistakes and no exceptions. You cannot delay your decision. What group do you choose?
Think of your answer before you go poking around at whatever comments might already be on this post. Post your own answer.