Much like the British monarchy, when the current Aga Khan is ready to abdicate his post, he will personally choose a successor.
A palace insider however insisted to the Daily Beast today that the Queen was not about to abdicate.
Juan Carlos is the second European monarch to abdicate in just over a year.
1540s, "to disown, disinherit (children)," from Latin abdicatus, past participle of abdicare "to disown, disavow, reject" (specifically abdicare magistratu "renounce office"), from ab- "away" (see ab-) + dicare "proclaim," from stem of dicere "to speak, to say" (see diction). Meaning "divest oneself of office" first recorded 1610s. Related: Abdicated; abdicating.