It's the opposite of a Lifetime Home. "Peter Pan Houses" are designed and constructed as if the occupants never change, and assume an "average person" of a typical height, weight, ability, mobility, vision, hearing, etc. In other words, you have to adapt to the house instead of vice versa. Depending on what life throws your way, you might not be able to stay.
Unfortunately, most houses and neighborhoods built since the Second World War were developed this way, more up than out with narrow passages, sharp corners, and lots of steps inside and out (even on flat lots!).
Thankfully, regardless of your preferred style, houses can be designed and built to proactively emphasize efficiency, convenience, comfort and safety for anyone of any age or ability. A Lifetime Home is flexible and socially sustainable, the antithesis of Peter Pan Housing.