You should be damn proud. Congratulations on your sobriety.
I haven't quit drinking. But about 10-12 years ago I started drinking too much on the weeknights. A glass of wine here or there would turn into a whole bottle, and I just didn't like the way it was heading, especially since alcohol and other substance abuse does a number on my profession (lawyer). And as I was approaching 40, I noticed that alcohol started significantly affecting my sleep quality. So I stopped drinking on the weeknights altogether, with an exception here or there. And at that time, I also got back into the gym, so my sleep improved, I tightened up a midsection that had gotten soft and put on some lean muscle, and I felt better than I had been in a very long time. I've managed to keep it up as I hit 50 last month.
Even if someone doesn't have a significant alcohol dependency, I tell them that drinking really fucks with you as you get older. The empty calories and the slowing of the body metabolism adds pounds like it didn't when we were in our 20s and 30s, and it decreases your sleep quality, which is tied to so many other aging issues.