IMO sheng and shou both age dramatically. You should see how VERY dry warehouse storage shou changes in three years in HK. It goes from painful drinking to very nice indeed! And I wouldn't dream of drinking young V93 for example, but even two years of storage down here smooths it out significantly. I'm looking to see how the V93 tuos I have taste with three years of storage. It might be enough, or they might need another two years!
I've left a shou cake in between sheng for years with no ill effect. It was accidental! No negative effects whatsoever, however, and I've also done the same with a traditional storage sheng cake and fresh pu. The bacteria and fungi responsible for aging are in the air anyway. What I would avoid is very strong odors, and yes, as Philip said, crappy packaging material can be an issue.
I've seen a few Guangdong dealers chainsmoking cigarettes around their pu. Interestingly the pu had not picked up tobacco smoke odors, but maybe I personally was just overwhelmed by all the second hand smoke in the air!

Thankfully a lot of stores in China have open doors during the day, so it wasn't too unbearable for me to be discussing the benefits of wet storage in Cantonese with a human chimney!
Even the funkiest wet storage aromas from unscrupulous dealers who keep their storage literally WET by adding water will dissipate to a large degree with airing out, so it appears that the very nature of pu means it can air out significantly, given the right environment and enough time. I'm still trying to air out my 2004 and 2012 XG tuos and even a few days seems to be helping with reducing the fuel aroma I'm getting from them!