A bit late with a reply to this, but....
The equalities act does not apply to the forces.
I have just had my Commission extended having reached age 60 in September. It is possible, obviously, but by no means a given, as your unit will have to advertise your job to see if there are any takers still under 60.
Fitness doesn't persuade them on it's own, as I'm still doing 9 minute mile and a halfs, and can reach reach level 10.08 on the bleep.