You might look at US Mobile, we are paying $34/month for 3 lines.Not really sure quite what you're meaning, except the 55+ part (I'm 53). Anyway, 16 years with Sprint taught me to protect myself. T-Mob tried to screw me on the first day I signed up. I caught it.
But, this particular topic got started on Reddit this morning when a employee posted screen shots. In the screenshots it shows that customers are given the option to opt-out.
Right now, seeing no other carrier that will take eight lines at once (down from my usual 10), or that will be less expensive than actually staying and being forced on to a new plan - I choose to simply opt out.
But I've already started looking for another carrier. It will probably happen at some point (me leaving).