They see that people in this age bracket are delaying marriage. They’re delaying having children. They’re delaying permanent employment. People who were born before 1964 tend to define adulthood by certain accomplishments — moving away from home, becoming financially independent, getting married and starting a family.
Though the article does not mention India at all and all the stats used are either US or European, the idea of Odyssey years does not seem too distant from certain sections of Indian population.