If they're EOS system lenses, they should still work with newer cameras. Depending on exactly what they are, performance can vary a lot. Also note depending on the model of camera you get, the sensor size can be different from the old film, so the field of view will be correspondingly different. More affordable models have a field of view 1.6x smaller. If you want it to work the same as it did on film, you need the bigger sensor models like the 5D or 6D series. Recent ones don't come cheap, but older used models can help affordability.
_________________Canon DSLRs: 7D, 5D2, 1D, 600D, 450D full spectrum, 300D IR mod
Lenses: EF 35/2, 50/1.8, 85/1.8, 135/2+SF, 28-80 V, 70-300L, 100-400L, TS-E 24/3.5L, MP-E 65, EF-S 15-85 IS
3rd party: Zeiss 2/50 makro, Samyang 8mm fisheye, Sigma 150 macro, 120-300 f/2.8 OS, Celestron 1325/13
Tinies: Sony HX9V.