Can I donate my kidney? I'm just 18?

can you donate kidney in this age ?
yes , you can if you are over 18 
other requirments :
1. being healthy
2. assisting your overall medical condition 
3. test matches with reciever
regards one kidney patient or donating kidney :
researchs shows that donating kidney wont effect on your life expectency  , means it wont cause any harmful complications on the long term , but you are on the risk of getting high blood pressure if you didnt take care of your self and pay attention to your life style
General advices need to be followed to take care of your current kidney :
1. Avoid foods rich in protein, calcium, or any substances that may harm the kidneys
2. Avoid alcohol
3. Avoid foods that cause high blood pressure
4. Exercise regularly