United Nations - www.un.org
This site has a multitude of information relating to declarations, conventions, human rights issues and statistics. Interesting sites include the UN Principals on Older Persons.

UN ECLAC - www.eclac.org
ECLAC is the Economic Commission for Latin America and the Caribbean and responds to the issue of population ageing in the Americas and the need to address the changing economic situation in developing countries. 

Global Action on Aging (GAA) - www.globalaging.org
GAA is sponsored by the United Nations and maintains an information website that is up-dated each week to inform readers worldwide on current topics relating to older persons health & well-being, pensions and many, many more interesting issues relating to ageing.

PAHO/WHO - www.paho.org
The Pan American Health Organization / World Health Organization, as its name suggests, is primarily concerned with improving the health of people in the Americas, which of course includes older persons.
Interesting reports include:

• Protocol for the Nutritional Management of Obesity, Diabetes and Hypertension in the Caribbean.
• The State of Aging and Health in Latin America & the Caribbean (www.miahonline.org)