Ever since the Trudeau government's reported $10 million-plus settlement with Omar Khadr became public, one aspect of the debate has centred around whether he was responsible for his actions at the age of 15.
Accepted Islamic belief confirms the age of maturity at puberty.
For boys, this is marked by the appearance of facial hair, a deepening of voice, and other, less visible, hormonal changes.
For girls, the onset of menstruation denotes womanhood.
These milestones are established in Islamic orthodoxy, and their significance is implied in the laws of various Islamic countries.