So people who say it was wrong for the Prophet Muhammad (PBUH) to marry Aisha say that based on the society norms today. But BIOLOGICALLY it is a perfectly normal thing.
Also, the society at the time of the prophet was open to this concept.
If a woman is not ready, then why is she having her menstruation at this age ?
We find it wrong, because our society says so...Not SCIENCE says other wise...