Dear George,
For a traveler aged 85 years, there are only a few companies which offer insurance for overseas travel. Therefore i'm suggesting the following plans:

ICICI Lombard offers coverage for $25,000 and $50,000.
Plan Details

Trawelltag's National Insurance offers coverage for $50,000 and $250,000.
Plan Details

Bajaj Allianz Insurance offers coverage for $50,000.
Plan Details
As the traveler is 80+ the above companies have medical subimits (capping). You can purchase the policy online by filling simple online proposal form and without giving any medical reports for issuance of policy.
However Bajaj Allianz provides an additional option where the traveler can purchase the policy online by submitting medical reports.
Thank you,
NRIOL Customer support.
080-4110 1026