Sorting Laundry: Central Purpose

I think that this poem is about a couple aging through life together. Details of "shirts and skirts and pants recycling week after week" lead me to believe that this is about an aging couple. All their "wrinkles" still "in style" conveys that the two lovers are growing old together and ignore the aging process as a hinderence in their relationship. From these details, a central purpose in the poem emerges. I think the central purpose is to show that love is something that never grows old. The last stanza in the poem conveys this through describing how there is no material substitute for love. "A mountain of unsorted wash [that] could not fill the empty side of the bed" seems to depict this immaterial quality to love.