Why do so many people have an immediate, intuitive grasp of this highly abstract concept—“subjective age,” it’s called—when randomly presented with it? It’s bizarre, if you think about it. Certainly most of us don’t believe ourselves to be shorter or taller than we actually are. We don’t think of ourselves as having smaller ears or longer noses or curlier hair. Most of us also know where our bodies are in space, what physiologists call “proprioception.”
Yet we seem to have an awfully rough go of locating ourselves in time. A friend, nearing 60, recently told me that whenever he looks in the mirror, he’s not so much unhappy with his appearance as startled by it—“as if there’s been some sort of error” were his exact words.