Alright it's just a minor change.
Change
string status = InputMemberShipStatus();
to
string status = InputMembershipStatus();
The problem was you did not look carefully at the code. Exact name of method should be specified.
The next one probably is:
int age = Parse(Console.ReadLine());
to
int age = Int32.Parse(Console.ReadLine());
I will assume that you are trying to just get integer values from user. You will not get any result by specifying Parse alone. The compiler will throw an error if you don't have a object named as "Parse".