If more Marriott hotels begin to charge for the third and fourth adult in a room, they should clarify at which age they consider you an adult. Besides, they should copy other reservation sites in which you type the age of the other 2 passengers so you get an accurate quotation in your booking. I don't feel comfortable getting a booking for 4 people with 2 x $50 surcharges already showing in it. I need to have the certainty of which my cost will be well before check-in to compare against other options, Marriott or else.

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