Study on the topic of Vitamin D metabolism and age. Will be comparable in all mammals.

EFFECT OF AGE ON VITAMIN D AND CALCIUM METABOLISM
The following are effects of age on vitamin D and calcium metabolism:

- Decreased calcium absorption
- Intestinal resistance of calcium absorption to circulating 1,25(OH)2D
- Decreased VDR
- Decreased renal production of 1,25(OH)2D by the aging kidney
- Decreased skin production of vitamin D
- Substrate deficiency of vitamin D


Hence, with increasing age both vitamin D and calcium intake should be increased. Something that gets totally ignored with any rodent blocks or around here.

The general claim that the rodent block will be enough at any age must be consequently false.



https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3782116/