Age spots can happen to anyone who spends an undue amount of time in the sun, as the melanin is deposited near the surface of the skin if localized areas. If you are beginning to see age spots appear, one of the best remedies is to simply apply onion juice directly to the area. The concentration of active ingredients, such as allicin, as well as other antioxidant nutrients found in onions, can quickly eliminate these depositions of melanin and spread them out across the skin. Furthermore, onion juice can help rejuvenate the skin and counter any oxidative stress that might be wearing down the skin or causing wrinkles.