Age or liver spots are caused by years of exposure of the skin to the sun. They are caused by naturally(hereditary), stress or aging. It usually occurs on the face, hands, back and chest regions.  
Below are natural and home made remedies to reduce age spots.They are cheaper,safer and can be gotten at home. 

Lemon juice can be used to get rid of brown spots. It also helps to maintain a blemish free skin. 
Apply fresh lemon juice directly on the
affected area. Leave it on for 30 minutes before rinsing it off with warm or cold water. Do this twice daily,until you notice positive results. You can also mix it honey and bentonite clay and use it as a scrub,to get positive results .
Note:Do not go out into the sun without a sunscreen or sun block. Lemon juice makes your skin sensitive to sun rays and can cause sunburns. Always use it preferably at night.  

Castor oil can be used effectively to get rid of brown spots or age spots.
 Apply castor oil on the affected area.
 Gently massage the area for a few minutes.
 Leave it on for a few hours and then wash it off with warm or cold water. 
Do this twice daily to help fade the spots. Other oils that can be used include Vitamin E or Almond oil.

For Vitamin E, simply apply the oil twice daily on the affected area or bust a capsule on a teaspoon and apply the oil. 
Before using this procedure, ensure you exfoliate twice a week to allow the oil penetrate deeply into the skin. 

Garlic/onion paste can help get rid of age spots. Simply apply after exfoliating and allow to rest for 30-40 minutes. Then wash off with lemon grass/lime soap. 
                      Lemon grass soap

Papaya juice contains active lightening ingredients and can be used to get rid of spots. Mash the pawpaw and apply on face. Leave on for 30-40 mins, then wash off. You can also mix it with lemon juice to get faster results. 

NOTE:Before using any of the above recipes, ensure you exfoliate at least twice a week, using a quality scrub (such as bentonite clay, activated charcoal),a soap(such as lemon grass soap or any product containing glycolic acid) and most importantly, a sunscreen with SPF 50 to protect the skin from sunrays. 
I would love to hear from you.Contact me for further information or for more recipes, via my contact page.