When it comes to who is happier,people with kids or those without,most researches point to the latter.But a new study suggests that parents are happier than non-parents later in life,when their children move out.rnMost surveys of parental happiness have focused on those whose children still live at home.These tend to show that people with kids are less happy than their child-free peers because they have less free time,sleep and money.rnChristoph Becker at Heidelberg Universityin Germany and his colleagues wondered if the story might be different for parents whose kids have left home.To find out,they analyzed data from a European survey that asked 55,000 people aged 50 and older about their emotional well-being.They found that,in this older age group,people with children had greater life satisfaction and fewer signs of depression than people without children,but only when their kids had left home.