Stress often has a heavy strain which affects ones skin and unfortunately makes them look older than they actually are. What stress does, is it decreases the blood flow and nourishment which goes to the skin and causes a worn appearance, hair loss, or brittle nails. Stress is known also for the release of chemicals which cause inflammation and can worsen acne.
There are simple and practical Stress-management techniques such as deep breathing, and guided imagery can help ones skin look younger.
One popular and easy to remember method is called square-box breathing: First inhale for four seconds, then hold for another four seconds. Next, exhale for four seconds, finally rest for four seconds; repeat this pattern four times. Simple, to the point, yet effective.