Recently, the relationship between a man and a woman has changed somewhat. Some 20-30 years ago it was considered strange if a girl did not get married before the age of 20. But now everything is fine, because people are in no hurry to get married, marry, have children. This is especially true for residents of big cities, where there are many career opportunities, entertainment and nightclubs. In the constant race for knowledge at the university, career growth or bright entertainment, people lose sight of one of the most important questions - family, serious relationship, soul mate. People started to marry and get married later, but what is the normal age difference between a man and a woman to make the relationship strong and reliable? Of course, there is no definite answer, sometimes they say: "All ages are subject to love". Still, common sense should be above all.