That was my sneaker room nearly 2yrs ago... It's now a nursery

and most of what you see there has been boxed and is in storage. My kicks are mainly from 2000-2008 with maybe 80% being deadstock and about 50 pairs in rotation (enough to keep me going for a while LOL)!
Of the DS boxed pairs I've noticed yellowing on maybe 2 of them around the midsole but it really depends on each particular model's makeup/material. If they're kept in a cool, dark environment then I reckon a pair is good for 5+ years unworn... As has been mentioned though, outsoles can seperate and midsoles disintegrate on some older examples.
I've been meaning to sell most of my sneaker collection off, but have been pretty lazy about it... I've just lost the passion and space unfortunately
If anyone's interested here's a link to the album containing most of them, lots of AF, SB, Jordan's, Air Max, QS/HS and a heap of unreleased samples ranging from SZ 9-11US. Hit me up via PM for details
Here's one for the Lebron fans...