I usually strive for BBS, but will try out a DFS/SAS shave with two quick passes.
I guess that puts me in the age group that doesn't feel like the stubbly look works for them.
Age is perhaps an unfair simplification.
For instance, I also think blondes tend to sport shadow less, as the requisite length can end up looking more like poor grooming than fashionable indifference.
Not to get over-scientific and try to think of all the factors but I'm betting there are plenty more.