A new study published in the March issue of Population and Development Review found that parents under 30 are less happy than their childless counterparts -- and that the more children they had, the more their unhappiness increased.
Plus: Younger Moms vs. Older Moms
But the trend reversed once study participants hit 30, and by age 40, parents' happiness increased as they had more children.
Plus: Pregnancy Over 35
The study, which surveyed 200,000 people over age 15 in 86 countries, did not determine the age when people became parents -- so it's not known if older parents' happiness was a result of clearing the potty-training, picky-eating, tantrum-filled early years, or if it was because they'd decided to raise a family later in life.
Plus: Discover 10 secrets of happy moms in Parenting's new book!
How has your happiness level changed as you've gotten older?