my first thought was olive oil and lemon so i did a search to find more info.. i found:

SYMPTOMS—Age spots (also called liver spots) are the flat brown spots which appear on the skin. They are especially noticeable on the back of the hands.

CAUSES—Liver spots are different than freckles. Freckles are caused by melanin pigments which react to the sunlight in fair-skinned people. Liver spots are the result of a "ceroid" pigment build up in the skin of older people.

These latter spots are the outward signs of free radical destruction within the body. There is pre-oxidation of fats—in the cells instead of in the liver. Free radical damage produces waste materials in cells throughout the body, including the brain and liver. The causes are poor diet, eating rancid fats, lack of exercise, excess exposure to the sun, autointoxication, and sluggish liver function.

TREATMENT—

• Eat high quality food, purify the blood, nourish the glands, and keep the bowels open. Exercise
the body and the mind. Keep the immune system in good shape. Take nutritional supplements.

• A powerful helper is the use of vitamin E (800-1,200 units per day), which tends to destroy free radicals. Also take vitamin A as beta carotene. Obtain all your fats as unsaturated fatty acids.

• Eat quality protein foods and stay away from old seeds and nuts. The oils in them may be rancid. Do not use meat or milk. Do not eat meat.

• Drink enough water, and make sure it is either pure or distilled. Practice deep breathing. Learn how to relax.

• Avoid all alcohol, coffee, salt, tobacco, white flour, and white sugar. Avoid all chemicals, drugs, etc., in foods. Do not overeat. Center your diet around broccoli, cabbage, fruits, whole gains, nuts, oats, seeds, and soybeans. A high fiber diet is important.

• Go on a brief fast, to cleanse the liver.

• Avoid too much exposure to the sun.

• Do not use commercial skin creams. Use olive oil and a warm wet washcloth, then rinse with lemon juice and water.