After the Age of Reason, the D'ni people believed that true wisdom came around the age of 125. It appears also that a woman's fertility ended around that age. An individual reached the Age of Wisdom with a celebration, lesser in scope than the Ceremony of Readiness.
Regarding that status, the D'ni over than 125 were allowed to become highest ranks of teachers or leaders, such as Grand Masters or Lords of D'ni. Women were technically allowed to advise, especially the King of D'ni.