Just did a quick check on Columbus….
Travel insurance for the over 64’s can be difficult to find, with many travel insurance providers not offering policies. At Columbus Direct we have NO UPPER AGE LIMIT on our single trip policies. Annual multi trip insurance is available to travellers aged up to 74. We’ve a wide range of products available, and all can include cover for pre-existing medical conditions.
….so appears that according to their blurb they will insure you for a single trip up until the age of..99…bit risky but thats the principal..