The heart has no wrinkles.

The saying contrasts the body’s visible aging with the heart’s capacity to remain emotionally vivid. “Wrinkles” stand for time’s marks—loss of beauty, vigor, or social currency—while the “heart” signifies feeling, desire, loyalty, and the inner self. The claim is not that people do not change, but that affection and longing can retain a youthful immediacy even as the face and body alter. In Sévigné’s world of courtly and familial bonds, it also implies that sincerity and attachment resist the erosion of time, offering a consoling counterweight to mortality and the anxieties of appearance.