New parents who are thinking about starting a family may be buoyed by the findings of a new study revealing that having kids will make you happier!  But the bad news:  In like three decades.

Evidently, people who have children are happier than people who don't . . . eventually.  The happiness only really kicks in once the kids grow up and MOVE OUT.

"The results suggest that the finding of a negative link between children and well-being and mental health may not generalize to older people whose children have often left home already," the study says.

The experts say people whose adult children move out enjoy having the social support and their kids around to take care of them . . . but they like getting that without the stress of having those kids living under their roof.

(CNN)