I'm glad you are quitting! Now is the time, no matter your age.
My brothers both died of alcoholic cirrhosis, and what I can tell you about their physical condition is that it came on quite suddenly after years of heavy drinking, and them believing they were not being affected. They seemed healthy right up until 2 years before they died.
I was looking at pictures the other day and could not believe the dates on the backs; brothers both looked so good. Then kaboom one day: skin yellowing, belly ascesis, sores on the legs, neuropathy, impaired mobility, personality changes like you would not believe from the toxicity, and eventual death. I'm sure it varies a lot from person to person.
I think sometimes the liver, kidneys, heart etc. put up a valiant struggle and then just have had enough.
So: best wishes on your journey back to sanity and health!!!