NIH guidelines on Vitamin D.
At ANY age, making sure you have enough muscle is very important.
If your feet and ankles stiffen up, the amount of information going to the brain (proprioception) drops dramatically.
The ability to bend forward in a way that recruits the back, not the front, of the body is critical.
A different approach to sitting at work is sometimes required.
The Epley technique is based on a sound understanding of what causes BPV.