Java Practice It || 5.23 robustInput || Scanner, input, while loop, debugging, ! operator

Problem:

Question:
The following code is not robust against invalid user input. Change the code so that it will not proceed until the user has entered a valid age (any integer) and grade point average (GPA, any real number). You may assume that the user enters a single token of input each time when prompted. Here is a sample dialogue of how the code should behave:

Type your age: hello
Type your age: ?
Type your age: 3.14
Type your age: 25
Type your GPA: a
Type your GPA: bcd
Type your GPA: 2.5
age = 25, GPA = 2.5