In your thirties, skin loses a lot of the oiliness it had during your twenties, so make sure to moisturize regularly to help return the natural glow to your skin. Expression lines may become more etched, especially around the forehead, eyes, and lips, though these signs of aging may be mitigated by wearing sunglasses outside and not smoking. Those that have experienced large swings in weight (repeatedly gaining and losing a significant percentage of your body mass) may notice their skin has lost some of its youthful elasticity.