The mothers

I once read - it was about happiness research - that children don't make really happy. Actually, the opposite is the case, couples without children in age between 30 and 40 years are generally happier, or at least are more satisfied than parents. It changes only around 50 when the children are out of the house: The happiness of parents increases significantly compared to couples without children. Is the slogan than “hold on”? It seems that Family, like as a project with 15-20 years, brings true happiness at the end. But 15-20 years, that's a really long time!