Humans are the ony species who put these artificial strictures on their development Xordium, if we look at this dispassionately a woman (and a man) is simply ready whenever they reach puberty (so at 12 Aysha was probably at that point). Another point is that God (or the equivalent) according to most religions is not overly onerous in his expectations of mankind at any given juncture, hence in Christianity for example there are differing covenants (expectations) according to the respective development of Man. Expectations of God are supposed to be attainable in the individual as well as the society of which they are part, a significant part of most religions is the concept of moral and ethical development and enlightenment over time, not just aimed at the individual but mankind itself as it moves out if its civilisation infancy and develops as a collective rather than individually.
Also we don't always move forward ethically and morally, in fact there are clear examples that while societal morals change they are not always for the better, it is a matter of perspective and how society defines its morality rather than any objective improvement across human society as a whole. Morality and the promotion of it is largely linked to many other external factors such as societal stability, wealth and institutional provision of law...you, like myself spent time in Congo I recall, look what happens when those societal controls fail, ethics and morals get ignored or are drastically altered to suit the wants and needs of the individual often with horrific consequences.