Anyone care to explain it ?
We retired early and signed up for health insurance on fed exchange. I found it relatively painless, the area I lived had plenty of plans to choose from. Picked a plan, provider mailed me some stuff, and on 1st of following month my wife and I were insured.
They use your income (MAGI) to determine subsidies and cost sharing, not assets. This is important, if you have 2 million dollars sitting in the bank, sell 80k of stocks which throw of capital gains of 30k then congrats you're poor on paper (income 30k) and get help. If you're within 400% of poverty level (that is about 64k for a couple) you'll be in range. Subsidies are available on all plans but silver plans you can also qualify for cost sharing which can greatly reduce your max out of pocket and deductible.
Our health insurance premiums are affordable and the plan is reasonable. We're in our 40s so mileage may vary as you approach 60+ years but in theory if you are on subsidies it should be age-agnostic since the goal is to keep it a percentage of income. Higher age = higher premium but also higher subsidy to your total stays same.
Anything else you want to know just ask, I've got no skin in the game politically and am actually enrolled as opposed to the partisan windbaggery coming from either side via people who have no actual experience with it.