In reply to An Triubhas:
Hi there. I'm a BMG member based in Chamonix. I started the scheme aged 37 and qualified at 41. I'm now 52 and with luck will be working as a guide for at least another 10-15 years. For more background see
http://www.bmg.org.uk/index.php/eng/Community/Being-a-Mountain-Guide/Andy-P...
As previous posts on this thread point out, age isn't that important. Meeting the pre-requirements takes time and commitment. I'd been mountaineering for nearly 20 years all over the world when I applied to join the scheme, and still had a couple of things to do before I was accepted. And since then the level of skiing required has risen, and fulfilling that would have taken me a couple of ski seasons.
Once the pre-requirements are met, you need 100% commitment, lots of time and a very understanding partner. And of course the necessary financial backing, but thinking of the scheme primarily in financial terms isn't that relevant.
It's not necessary to speak French, as the scheme is run by the British Mountain Guides, though ability in any of the languages of the alpine chain is useful.
I'm glad Murko Fuzz enjoyed the BMG open day. For details on this, see
http://www.bmg.org.uk/index.php/eng/News/British-Mountain-Guides-Open-Day-2...
As he put it, "Ability, experience and performance are very much requisite. "
Good luck, and enjoy your climbing!
ANDY P