Why don't you use
console.log( age );
I tried your code using a windows 8.1 IE11 environment and got a pass....
under certain circumstances you can shoot your Browser in an
Therefor it is of an advantage to know that you have 2 reset facilities:
One is the use of the F5-key which does a refresh Browser
Two, select© your code
Then use the Reset Code button of the course-window,
then paste your code back in.
Always refresh the browser after making corrections:
CTRL f5 ( if on Windows or Linux)
CMD r ( if on a MAC).