Anniversary announcements published in the national AA newsletter are used to analyze membership turnover in Finnish AA. Of the total membership with at least 1 year of sobriety, close to 90% continue as sober members for another year. Of those having 1 year of sobriety, about two-thirds survive to the next year. The survival rate of members with between 2 and 5 years of sobriety is about 85%. Among members with more than 5 years of sobriety, the survival rate is above 90%. There are no gender differences in survival rates. The sober membership of AA represents between one-third and one-fifth of general population survey estimates of the number of abstaining former frequent drinkers with concerns about losing control over their drinking behavior.