I was trying to figure out the same question myself. So I figured a woman's life expectancy is about 80 years, and a males is about 75 years. According to wikipedia, a person produces between .75 and 1.5 liters of saliva everyday. So using the .75 liters, I think a woman would produce 21,900 liters of saliva and a male would produce 20,531.25 in a lifetime. I'm not positive that this is right. But that's what I came up with!