SYDNEY: Living happily ever after needn't only be for fairy tales. Australian researchers have identified what it takes to keep a couple together, and it's a lot more than just being in love.

A couple's age, previous relationships and even whether they smoke or not are factors that influence whether their marriage is going to last, according to a study by researchers from the Australian National University.

The study, entitled "What's Love Got to Do With It", tracked nearly 2,500 couples - married or living together - from 2001 to 2007 to identify factors associated with those who remained together compared with those who divorced or separated.