Shouldn't the answer be ages 65 and over, since the code doesn't use else if. It uses if a second time.

When the code is run, the computer reads all the lines from top to bottom and will carry out all the code that was written (unless you specified to end the function after the first condition).

So when it reads the first if statement

 if(customerAge < 13){
        ticketPrice = 5.00;
    }

It will check the condition; if it's true, it will run the code inside the statement and then go to the next line of code; if it's false, it will ignore the code inside the if statement but it will also move on to the next line of code as you haven't specified whether to end the function if false or not.

Because of this (you haven't ended the function), the next if statement will be read and the conditions checked. This is bad, as it could override any of the previous logic you had written which will cause problems!

It's like creating a smoothie: Imagine you want to create a banana smoothie and the if statement checks how hungry you are to determine the number of bananas you use.

int hungryLevel; 
int numberOfBananas = 0; // we start off with no bananas

hungryLevel = 50; // we set our hungryLevel at 50

if (hungryLevel < 60) { // we check to see if our hungry level meets the conditions - it does!
numberOfBananas = 2;
}
// because our condition returns true, after the first if statement, the number of bananas used will be 2
// however, since we do not end the function, or specify how to handle the code after this is true, the next lines of code will be run!

if (hungryLevel == 50) { // so now this if statement will be checked...but oh no - that's a lot of bananas!! but this condition is also true
numberOfBananas = 10; // so the number of bananas will now be 10 and we have overrode our previous logic 
} else {
numberOfBananas = 5;
}