We present the light curve of the old nova V603 Aql ( Nova Aql 1918 ) from 1898-1918 and 1934-2013 using 22,721 archival magnitudes . All of our magnitudes are either in , or accurately transformed into , the Johnson B and V magnitude systems . This is vital because offsets in old sequences and the visual-to- V transformation make for errors from 0.1-1.0 magnitude if not corrected . Our V603 Aql light curve is the first time that this has been done for any nova . Our goal was to see the evolution of the mass accretion rate on the century time scale , and to test the long-standing prediction of the Hibernation model that old novae should be fading significantly in the century after their eruption is long over . The 1918 nova eruption was completely finished by 1938 when the nova decline stopped , and when the star had faded to fainter than its pre-nova brightness of B = 11.43 \pm 0.03 mag . We find that the nova light from 1938-2013 was significantly fading , with this being seen consistently in three independent data sets ( the Sonneberg plates in B , the AAVSO V light curve , and the non-AAVSO V light curve ) . We find that V603 Aql is declining in brightness at an average rate of 0.44 \pm 0.04 mag per century since 1938 . This work provides remarkable confirmation of an important prediction of the Hibernation model .