"Medicare for All" is the idea that's been getting attention from progressive Democrats, but Forbes flags another one that could get attention over the next two years: letting people buy into Medicare between the ages of 55 and 64.

Between the lines: It's a more incremental, centrist option for Medicare expansion than the sweeping idea that's generating excitement in Democratic circles. (Bill Clinton floated a version of it during his presidency, and moderate House Democrats are its main backers now.) But as Forbes points out, Sen. Sherrod Brown, a possible Democratic presidential candidate, has sponsored a version of Medicare at 55 — so it could get attention if he runs.