Public opinion in general maintains, that men should not marry until they have attained their twenty-fourth or twenty-fifth year of life. This opinion is founded on the fact that few men are able to support a family before they have reached this age. Only persons who are fortunate enough not to be obliged to win an independent position,--persons of princely rank, for instance,--form an exception. In their case we regard it as quite proper that a man should become married at eighteen or nineteen, and a maiden at fifteen or sixteen years of age. Princes come of age when they are eighteen years old, and are considered competent to rule the most numerous people. Common mortals do not come of age until they are twenty-one years old.
This difference of opinion in regard to the age at which marriage is desirable, shows that only social considerations are taken into account, that have no bearing upon man as a sex being. But nature will not be fettered by definite social conditions and the views that have sprung from these conditions. As soon as a human being has attained maturity, the sexual impulse manifests itself with all its vigor.
The advent of puberty with the female sex differs according to the individual, the climate and the mode of life. In the torrid zones it sets in as early as the ninth or tenth year, and sometimes one meets women of that age with their first babes in their arms; but they are faded when they have attained their twenty-fifth or thirtieth year.[81] In the temperate zones girls usually attain puberty at fourteen or sixteen years of age, in some cases later still. The age of puberty also differs with girls living in the country from those living in cities. Among the healthy, robust country girls who work hard, as a rule menstruation sets in later than among our poorly nourished, effeminate, ethereal young ladies in the cities, who suffer from over-excitement of the nerves. In the country puberty usually developes in the normal way. In the city its normal development is an exception, and not infrequently it is accompanied by various symptoms of disease that drive physicians to despair. Often physicians are obliged to say that the only certain cure would be marriage. But in many cases this cure cannot be applied, owing to the unsurmountable obstacles.