public bool IsOlderThan(Student studentToCompare)
{
if (studentToCompare.GetType() != typeof(Student))
{
throw new ArgumentException(String.Format(TYPE_ERROR_MSG, studentToCompare.GetType(), typeof(Student)));
}
DateTime ageOfCurrentStudent = GetBirth(this);
DateTime ageOfOtherStudent = GetBirth(studentToCompare);
bool isOlder = ageOfCurrentStudent > ageOfOtherStudent;
return isOlder;
}