Your skin holds whole of your body together. It is the single-most organ of the body facing the external environment and changes, all by itself.
Hence, it is quite natural for your skin to be amongst the first to get affected by any physical or psychological upheaval. For instance, if you happen to be in an environment full of dust, you are bound to notice the impact on your skin just after a few hours. Similarly, stress shows up on your face before anything else. The minute you have a tense moment, those close to you can immediately make out from the signs on your face.
God forbid, if you happen to be under a stress for the most part of your day, eventually the fine lines in your skin will begin to reflect just that. And the situation surely worsens if you are in your 30s or beyond, because that’s when the skin’s resistance is at its lowest.