Hrm. Tokyo probably wouldn't be considered a walkable city in that person's view. Benches can be thin once you get outside the station area. Most people live within 20 minutes of their station (rents drop dramatically after that in most cases), but 3 would probably be too expensive, especially for a pensioner (not sure how old this self-proclaimed old person is). Tokyo is doing better than it used to in terms of escalators and elevators, but a lot of places still just have stairs for now. I certainly wouldn't want to be in a wheelchair or on crutches around here, though it's mostly doable.