Crowley himself wrote in 1578 that he was then sixty - one years old .
Emden 's A Biographical Register of the University of Oxford says that Crowley was twenty on 25 July 1539 .
Crowley himself wrote in 1578 that Crowley was then sixty - one years old .
Emden 's A Biographical Register of the University of Oxford says that Crowley was twenty on 25 July 1539 .