Kaleidoscope Century by John Barnes
Joshua Ali Quare lives life to the full - deacdes before, he was infected with avirus that ensures that for every fifteen years he lives, he gains another ten. After each virus induced coma, he wakes with his memory erased and ten years younger. This time round, in 2109, someone is looking for him and it is time to pust the record straight once and for all; doing so takes us through a century of gripping future history.