Can someone explain why the answer is $10?

Quiz question 2 of 3 on the Basics of Objective-C course asks which age ranges will not be handled correctly, based on the code for a mythical theatre ticketing system.

The correct answer is shown as being “All ages under 13.”

The question presents the following code:

int customerAge; float ticketPrice;

customerAge = 13;

if(customerAge < 13){
    ticketPrice = 5.00
}

if (customerAge >= 65){
    ticketPrice = 6.00
}

else{
    ticketPrice = 10.00
}

While I understand that the customer is 13, and will therefore be charged $10, I don't yet understand why everyone under the age of 13 is not handled correctly, as that age group would surely be charged $5? And 13 to 64 year olds would be charged $10?

Therefore, wouldn't the correct answer be that 13 to 64 aren't handled correctly?

Can someone please explain for me?

Thanks, Arron