"Underestimated healthcare cost growth in my retirement plan."

Healthcare is one of the most important factors in early retirement planning. It's often the biggest or second biggest annual budget line item. But what I didn't fully appreciate until recently is how fast it grows relative to everything else.

There are two main reasons it grows faster.

First, age-rating. On the ACA marketplace, premiums are generally tied to your age (except VT and NY), and the curve is not linear. There are meaningful step-jumps as you cross rating bands, with some of the st