The first price is an estimated price and the second is the confirmed price. The estimated price is based on the arrival date and does not take into account the ages of any children travelling and any extra supplements as a result. Different hotels specify different maximum ages for passengers to be classed as children, though the most common maximum child age is 12. If you are travelling with children you will be asked to enter the ages of the children travelling with you. The ages entered must be the ages at the time of travel, up to and including the day of departure.