There was another recent study that made the front page of HN (would have to search to find it) that found two "peaks" of aging, at 44 and 60. As someone in my late 40s, I certainly identified with that.
I was in fairly good shape and feel like, despite some grays and some crows feet, my body was relatively the same from my early 20s to my early 40s. 44 really did hit me like a ton of bricks though - working out got considerably harder, and my face started to show more permanent signs of aging, like loss of facial fat and neck banding. Can't say I was thrilled to later discover I was "right on schedule".
I was in fairly good shape and feel like, despite some grays and some crows feet, my body was relatively the same from my early 20s to my early 40s. 44 really did hit me like a ton of bricks though - working out got considerably harder, and my face started to show more permanent signs of aging, like loss of facial fat and neck banding. Can't say I was thrilled to later discover I was "right on schedule".