Less sunlight exposure = faster biological aging?

It's a biomarker but does it really mean anything?

High vitamin D seems to be associated with everything good like income and your team winning the Superbowl and low vitamin D seems to be associated with everything bad like being a disadvantaged minority or getting cancer or living in a high crime neighborhood.

There are so many studies where they give people Vitamin D and it seems to do absolutely nothing so I hear "Vitamin D" and I'm skeptical particularly if the endpoint is some biomarker and not some outcome like strokes or heart attacks or cancer or something.