Uhm, sweety, the men and women in the South age much faster than the ones in the North. I'm not implying anything, but a woman of 20 years old was expected to be a mother (of two). Looking young and not having a beard at 20 for a man indicates some generic conditions for the southerner.
Vice versa "calling your mum and showing her something" is prevalent even in modern times among 30yo men. Furthermore not every man is married by the time he hits 30, some remained childless throughout their lives (think of Jesus for example). Term remember that only a third of men had their offspring pass their genes onto us (and only 2 this of women had their children (if any) procreate.