Is there any role for 25-OH Vitamin D testing in patients older than 75 years old in the general population?  

The recent Endocrine Society Guideline on Vitamin D no longer recommends testing for vitamin D status unless there are unusual circumstances. The Guideline however recognized that approximately 20% of adults greater than 75 years of age are vitamin D deficient i.e. 25-hydroxyvitamin D <20 ng/mL. ...

Measuring 25 OH vitamin D in truly healthy population of older patients is not indicated. As a reminder, people who live in congregate living housing or long term care facilities should have levels measured. Also check levels in people with malabsorption syndromes.