I add about 1/2 cup of baking soda to every load of laundry. We have pretty hard water. The baking soda softens it so that it is more effective at washing away the detergent. Been doing this for a couple of years and I have noticed that our towels don't lose absorbency like towels we've had in the past.
The average number of children each woman will have over the course of her lifetime is called the Fertility Rate In 2011, the overall global life expectancy for both men and women was
Since 1985, the rate of women having their first child between age 40-44 has risen steadily, though it's still far below that for women ages 35-39: CDC. Rates for all births, not just of a first child, to women over 35 have been rising over the past 20 years, while birth rates for younger women are stable or declining. Still, the majority of births are to women under 35, about 85% of the total in 2013.