Insurance for older riders?

Does anyone out there know of any companies who’ll do sports/travel insurance for older riders? We’ve just spent an awesome week riding with Bob Grundy who, at 69, is a stronger rider than most half his age. Alas Bob’s not having any joy looking for insurance for next year as most companies stop covering people at 70. Please give us a shout if you have any ideas!
On the plus side, I’m now looking forward to at least another  37 years of mountain biking – thanks to Bob for the inspiration!