I am confused about creating int variable for age in number 4 of excercise 4.
For reference, here is the task:
Create an int instance variable called age.
Have you looked at the example for that exercise? It says:
In the example above, we created the instance variable named modelYear.
There is a picture in that example showing the instance variable. It looks like this:
Can you tell me what doubts you are having about creating an instance variable called age?