If you are a retired government employee and have FEHB then when you hit 65 you will basically be forced into Medicare, You may still keep your FEHB which includes Prescription Drugs, so you won't have to enroll in part "D" for Prescription drugs. FEHB will pay what Medicare doesn't pay [Part "B" pays only 80%] it works like Medicare Advantage plans. You are not eligible for the ACA when you Become 65.
Depending on your age the ACA has a more expensive Premiums larger coinsurance and deductibless than Medicare and FEHB plans.
I checked it out for the wife and I and lied about my age with me at 63 and the wife a 60 with an income of $62,000, with the ACA we would get no subsidies and our yearly premium would be $17,750 a year, in addition if we are smokers they would charge an additional 20% to 50%. WHAT A RIPOFF!:nuts: