I just plainly state that I've drank enough up to the age of 42 that it no longer appeals to me. There is truth in that statement without blatantly coming out and stating I'm an alcoholic to work associates. I've drank way way past my lifetime quota if I was even a normal drinker.
No one has questioned me or batted an eye and I haven't been dramatic or proclaimed it.
I've regifted the bottles of wine I did have at Thanksgiving and find more and more that many don't drink or feel the compulsive and obsessive attachment to it as we all do/did.
My best friend found it shocking that I stopped, but then she drinks moderately and didn't know the degree to which I was killing myself.