Once you hit your 30s, your skin will still be oily, but your insides will feel tight and your complexion will take on a grayish hue. To avoid being called "old man," you need to focus on "whitening" and "hydration." In the morning, use a cleansing agent with a cooling effect to reduce puffiness, and apply an all-in-one product with whitening functionality (niacinamide) to remove dullness. If you have an important meeting coming up, it's also a good idea to lightly correct your skin tone with a men's color lotion. In the evening, after thoroughly washing your face, you should start applying eye cream to the wrinkles around your eyes and nasolabial folds. If that's too much trouble, buy an eye cream that you can apply all over your face and apply it generously. Washing behind your ears and neck thoroughly to prevent that "old man" smell is just as important a self-care as skin care.