Using data derived from a semi-longitudinal interview study of 45 urba
n, community-living African Americans aged 65 and over, this paper exp
lores gender differences in informal social support. Women were found
to have significantly larger, more extended informal social support ne
tworks than men. Adult children daughters in particular were key figur
es in the networks, especially for women. Men, especially men married
to women who were not the mothers of their children, have small and vu
lnerable networks. The size and composition of informal social support
networks were stable over a six month period, despite some change in
the health and physical functioning of respondents. Informal social su
pport networks existed long before such networks needed to be mobilize
d for caregiving purposes, and such networks arose in response to soci
oeconomic and affiliative needs across the entire lifespan rather than
just in response to health or physical function needs in late life. S
ocietal marginalization of Black men throughout their life has had pro
found effects on their access to informal social support in late life.