Curious console.readLine Question

Had one question about the readLine method.

If we declare a string variable: String ageAsString = console.readLine("Type in your age: "); doesn't the whole line (Type in ... etc., including the answer from the user) become a string?

If so, how then do we apply the parseInt method to the string "Type in your age: 34" and have the result change only the "34" part of the string to an int?

Is that the readLine method only reads the input from the user, and ignores the rest of the string?

I tried doing this in jshell.

I typed String ageInput = "Type in your age: 45";
and got this result: ageInput ==> "Type in your age: 45"

Then I typed: int age = Integer.parseInt(ageInput);
and got the following voluminous error: | java.lang.NumberFormatException thrown: For input string: "Type in your age: 45"
| at NumberFormatException.forInputString (NumberFormatException.java:65)
| at Integer.parseInt (Integer.java:652)
| at Integer.parseInt (Integer.java:770)
| at (#2:1)

Can anyone satisfy my curiosity and explain why this doesn't work?