The issue of his immortality versus Alec's mortality is brought up several times in City of Fallen
Angels, when Camille, Magnus's ex-girlfriend/lover, says that in sixty or seventy years, Alec will
eventually age and die while Magnus will continue to live on forever. This in which, causes
heavy complications in the two's relationship. However, it is revealed in City of Lost Souls that
Magnus had been seriously considering taking away his immortality, confessing that while he is
immortal, all he has wanted was to find someone he loved to live the rest of his life and to
grow old with and had hoped and wanted for it to be with Alec.