Is your hypothesis that avoiding sun exposure slows aging generally, or just that it makes the skin look younger? I’m worried about many of the effects of aging, but don’t care a whole lot about how my skin looks.
Have to disagree with this one, everyone who can't escape sunlight and likes to go outside at all is affected. People in the American southwest from all walks of life age shockingly faster (in appearance) than their northern state counterparts. I'd meet women who were 25 and looked 35 (by northern expectations), and it only accelerates from there (35 looking like 50, 50 looking like 70).