The age of the partners, previous relationships, and, for example, Smoking one of the spouses is the factors that play a huge role in the success of marriage, say the researchers from the Australian national University. The study involved about 2,500 couples who were married or lived together from 2001 to 2007.

The study examined what factors contributed to the fact that the pair lived together for so long. The results were compared with couples who are divorced or live separately. It was found that when the husband 9 or more years older than his wife, doubles the risk of divorce. The same situation occurs if the spouses were married before the age of 25.

Another important indicator of relations. The researchers found that the divorce ended the relationship 1/5 of couples who had children (either from previous relationships or current) before the wedding. For comparison, the divorced only 9% of couples without children before marriage.

To divorce are also more likely women who wish to have a baby more than their partners. Similarly, play a great role in the future of marriage and parents are partners. The study showed that 16% of men and women whose parents are divorced or separated, and also divorced. In contrast, divorced less than 10% of couples with divorced parents.