This BBC World Service proramme discussed why women live longer than men (in every country except Afgahnistan and Jordan). It quotes data showing that castrated men live longer, data from Korea about court eunuchs and historic US data from state institutions

http://www.bbc.co.uk/programmes/p0123663

A link to the thread about the life span of Korean eunuchs can be found at:

http://www.eunuch.org/forums/showthread ... an-eunuchs

There are also references on that thread to the data from mental institutions.