To answer OP, if you put a cigar in a vacuum tube and open it up 100 yrs later, It will taste the same as the day you sealed it. I think Wilkey wrote about this a while back somewhere. It's all about storage.
Personally, I don't think there is a set time table if you are set on smoking all your stash. I find that a cigar is at its pinnacle when there is no more refinements that can be made, regardless of how long that takes. And for each person, finding that balance is a subjective mark. Like fine wine, some prefer to experience the richness in relative youth to the aged complexity; the degree in which you find your utility varies. I used to enjoy the big bold flavors in a young cigar and took the tannins as the cost. Now, I find that I very much enjoy the subtleties of various distinct flavors in aged cigars - almost pure flavors without the jet fuel feeling in the nose.
As for NCs, I have found some blends just don't stand up to aging. Several yrs and they go flat. Broadleaf is a good example IMO. As for Padron, boy, if you can tell the difference between pre-serial and current, good for you. 8yrs aged? f-me. I'll smoke that now, thank you.
All relative.