It is rather unclear whether you need a Firenze Card for a 17 year old American citizen or not. The Card's website makes reference states that, when an under-18-year-old is entering the state museums with a Card-bearing parent, they are to "collect the free ticket and buy a reservation-paid directly at the Firenzecard reserved access entrances." What do they mean by "buy a reservation?" Can it be for a later time, forcing you to return later in the day, thereby negating the main benefit of the card?
Any insight and suggestions would be appreciated!