Eddie, I wouldn't worry too much about "decades" without alcohol. In early recovery, I got anxiety when I would think about events in the future and me not drinking at them. Getting myself all worked up over things that haven't even happened yet, and likely won't even happen the way I currently envision them. Just worry about today. And tomorrow, do the same. Thinking beyond that can be overwhelming.
When I tell people I don't drink, they often ask, "For how long?" I tell them I don't have a date or a time frame. I can't say I'll never drink again, because I don't know the future. But I can say with near certainty that I won't drink today. When I hit the sack tonight, no alcohol will have touched my lips. I don't get concerned with anything beyond that.