And once one is Medicare eligible age, they get booted from Tricare. I met a retired US Army doctor at the Y. It happened to him. Then when he needed a knee replacement, Medicare denied him access to the latest method that has the shortest recovery time, by months. The reason? His age. Medicare said he was too old to be worth the slightly higher cost of the newer method. And once Medicare denies a treatment method, it is ILLEGAL for any doctor to accept cash payment for the difference in cost or the full cost.