Terminals 2, 3, 4, 5, 6 andd 7 were built in the early 1960's.
T1 and the TBIT were built in time for the 1984 Olympiad.
T2 (the international terminal before TBIT) was rebuilt around 1984. T4 was extensively refurbished in about 2000, and T5 was extensively refurbished around 1988 (when Delta acquired Western Airlines). AFAIK Terminals 3, 6 and 7 have not been extensively remodeled (corrections welcome).