Oh fair enough. I just asummed that because she hadnt passed her test she was young 17/18/19.
Theres a nice thought aye 
My wife is younger than me 23 (I'm 27) and she hasn't passed her test yet. No real urgent need for her to drive because we live in London.
As for the Glove box catch, you get two bits, the outer handle and the inner catch mechanism. Just open your glove box, undo 3 or 4 screws (these fix the inner part to the outer handle) and pull the old bits out. Put the outer handle into place, line up the inner catch mechanism and then screw into place. Job done.
You can keep the lock barrel by the way, so you don't have to worry about a non-matching lock.