You Have More Brown Spots
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"Once you hit your 40s, past sun exposure comes back to haunt you," Brandt says. "Men are less careful with sunscreen, so their faces bear more brown spots and broken capillaries." The sun is one massive insult to your skin. "One out of five Americans will develop skin cancer in their lives," says Dr. Charles Boyd, a plastic surgeon in Michigan. "What's more, malignant melanoma is a leading cause of cancer deaths in young men." 

The solution: Sunscreen. Wear it. If you spend a lot of time outdoors, use an SPF of 50 or more; otherwise, a broad-spectrum SPF 30 will do the trick. Brandt also recommends moisturizer with a lightening agent like kojic acid or licorice.