At what age the woman's menestration stop?

http://www.fbhc.org/Patients/Modules/menopause.cfm

Menopause typically occurs between the ages of 45 and 55, with the average age being around 51. However, it can occur as early as the 30s or as late as the 60s. The best way to determine when a specific woman will experience menopause is to track her menstrual cycle over time and look for patterns. It is important to note that menopause is considered to have occurred once a woman has gone 12 consecutive months without having a period.