Linear (or Infinity) drains rid the need for thresholds to enter walk-in showers. But what other things make it more Aging-In-Place? How about the width of hallways & door ways? How about installing heated tile not only in the Bathroom but also in the Bedroom? It's by far the most comfortable heat and helps your joints loose and body warm. How about separate vanities like his and hers? Well, that just helps the marriage even after 40+ years together :-)