Democrats are embracing proposals that would lower the Medicare eligibility age to either 50 or 55 in an effort to expand health coverage without fully upending the current system, but industry groups are wary of the idea and warn it could be as disruptive as moving to Medicare for All. Rather than a mandatory, Medicare for All type-proposal, a Medicare Buy-In would be optional under most proposals and only allow older Americans coming up on Medicare eligibility -- ages 50-64...