The brain has very high what scientists call, "plasticity," meaning it is very good at "bouncing back" (healing itself) from damage.
As far as ethyl alcohol and cocaine, EtOH is probably worse as it actually kills brain cells, something not even MDMA does. Both cocaine and alcohol are bad when used excessively, but long term, moderate usage causes no real harm. Be aware that cocaine is one of the most addictive--if not the most addictive--recreational drug out there, and the more you take/use, the worse the cravings get, and for powdered cocaine, the worse the comedown will eventually be.
But yeah, I have a 102 year old great uncle who drank liquor every evening/afternoon for years and years (well into his 90s I think), and he's still alive. He's nearly deaf, but alive.