I mean yes, but OP's comment is especially notable with Vit D because it's deficiency is very common and often a marker for other common age related diseases.

I mean yes, but OP's comment is especially notable with Vit D because it's deficiency is very common and often a marker for other common age related diseases. It is highly likely that Vitamin D isn't saving these people's lives, it's that the folks without vitamin D are older and/or have disease.