Suggest going online for "travel insurance"
There you can compare more than a few companies rates and what they offer
I have used Travel guard and Allianz
Of course you never know till you have a claim but do know people who had good results withnAllianz and it is the most reasonable and not to do with age
Please note that you cannot use MEDICARE nor most US health insurances outside US. Be sure to check your own private insurance
Sometimes the airline or travel company will give a special rate