Hi Darryl
Sorry, I thought the age of the mower can be determined by the model number?
I took some pics with my iPhone but can't work out how to get them on the computer so I will try and get some pics after work later on today with my camera and will also post up the numbers of the engine.
It wasn't cutting all that well so I adjusted the blade (gap was way too big) and now it is cutting sweet. The 45 has a better feel than the 33 I think. Seems easier to steer/control. I think it must be due to the shape of the handle?