Tudor -
No. Here in Australia... Getting more and more like the US every day.
GLAcc -
Here in Australia it is 15 and over. You can be 15 and sit at an exit.
The AirTours 737 incident at MAN really brings home the importance of being able to open the exit quickly and get out. Perhaps some photos of the incident placarded on the back of the seat in exit rows would help our pax to decide whether or not they really are up to the challenge (as opposed to giggle and laugh at the exit row briefing)...