A new study replicates the 2007 findings from a Mayo Clinic paper that indicates that an earlier age at surgical menopause (oophorectomy) may be associated with faster decline in memory and global cognition.
In a related report, hormone therapy may reduce the risk of Alzheimer's disease for women that receive treatment within five years of the time of menopause. These women had a 30% less risk of developing Alzheimer's. This effect was lost if treatment was received five years or more after menopause.
Neurology Oct 30, 2012