Technically, a much neater space. But in reality, so much more.
More free time.
With a clutter-free space, they will spend less time maintaining their home and more time hanging with friends and family (that's you!).
With belongings having a designated, labeled home, the other people in the household (the kids, the housekeeper, the in-laws when they come to visit) will know exactly where to find things. Ah, serenity.