Better answer
Quick underwriter survey this afternoon. Here are the answers for insurance for 70 + year old pilots. All agents - Falcon, Nationair, AOPA, etc. have to place you with one of these companies.
Global Aerospace - new business up to age 69. Through their 70's if they are EAA members - tell your agent if you are!
Chartis (AIG) - New business up to age 70. Maybe a few years beyond, depending on type of aircraft (ie. Cessna 172 better than a Mooney). Might take you for a few more years in certain LSAs.
Aerospace Insurance - New business up to age 70. Up to 75, if the pilot gets an ANNUAL medical - even for LSAs.
US Specialty - Won't quote anyone over age 75, regardless of aircraft type.
Most, if not all of these companies will continue to renew policies for pilots into their 80's. But, at that point, your insurer has become the only game in town - any wonder that prices creep up?
We are working with a new company now that SAYS that they are offering new quotes up to age 79 - more info when we flesh that one out.