The question itself is lame, because it's a matter of perspective.
OTOH, it's easy enough to define people who are definitely rich.
If you were a member of one of the 13,000 families who were the primary beneficiaries of the Bush tax cuts, you're rich.
If you don't know how many houses you own, you're rich.
If you have a personal assistant who takes care of all the details and arrangements, you're rich.
If the only times you drive are for pleasure in your automobile collection, you're rich. Otherwise, the car picks you up.
If you don't have the vaguest idea as to the cost of anything, like gas, food, insurance, airline tickets and whatnot, you're rich.
If you haven't lifted a finger doing basic tasks like cleaning, laundry, cooking, etc in so long you can't remember, you're probably rich.
If you have a live-in nanny who takes the kids to private school, picks them up, tutors them, you're probably rich.
If your income falls consistently in the top .3%, you're rich, because that's where the income curve goes vertical...