Getting older kind of sucks and makes everything worse. That said, I'm fairly fortunate. No real vices left and none ever had a real pull on me. Occasional over indulgence now maybe but on average pretty low levels of anything. Maybe it took some work to get here - I do notice the past years that I am strict without being strict. Say if I see chips in the pantry and on the odd chance I happen to be feeling it, maybe I'll skip it, maybe I'll have 2-3, inconsequential during most periods, and I'm done. Maybe I got balanced or boring or did enough that I no longer care.
One quote that always stayed with me, "Discipline is simply remembering what it is you want." That simple sentence says a whole lot more than it seems initially.