“I figure I should be able to retire when Im 80”. That is exactly my plan too, in 3 years. Then I plan to spend it all in the next ten years. Getting all joints replaced now for the last lap.
I've had the "F" plan for years... I have not paid one dollar to a doctor since I got it - and there are NO NETWORKS. Go to the best doctors your town has to offer... And don't let insurance people talk you into a different lettered plan - NONE of the rest of them cover excess charges... You don't want A or C or G... None of them give total coverage.
https://boomerbenefits.com/medicare-supplemental-insurance/medicare-supplement-plans/medicare-plan-f/