Les and Karen Walker aren’t retirees absconding from their day-to-day, they’re an active couple seeking, in simplicity, a whole new way of life. So last year, they sold their multilevel house, chucked their stuff, and moved into the most unremarkable house on the block. The 1955 California ranch squats in the midst of three acres, flanked by towering conifers. From the outside, it’s almost painfully prototypical, but beyond the eggnog-colored façade are clean lines and spacious, light-filled rooms—all signs of a couple going modern in their golden years.