2X less vitamin D from the sun for seniors - Dec 2011

From Solar UV Doses of Adult Americans and Vitamin D3 Production – Dec 2011

Figure 1. The percent drop in the ability to make vitamin D3 in human skin with age.

We normalized values to 100% using the children's values (0-20 yr).
The data plotted is the average of vitamin D3 formed in the epidermis and dermis from 0-20 yr (100%), 22-40 yr (83%), 41-59 yr (66%) and 60+ yr (49%); calculated from the data in Figure 1 of MacLaughlin and Holick (1985).
Note that some seniors over 70 yr make less than 25% of the vitamin D that children <21 yr can make.67 {In VitaminDWiki}
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The above graph was taken from 1985 publication

for skin type III
Wonder if there was any difference with cholesterol in the skin, which is a precursor of vitamin D
see: Overview of Cholesterol and Vitamin D

Publication PDF is attached at the bottom of this page
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See also VitaminDWiki

• Seniors, like everyone else, need vitamin D and should avoid sunburns – 2011 Dr. Glossman
  Does not seem to mention how much of a reduction vs age.
• How many minutes of sun do I need – age, skin color, UV index – Nov 2014
  • 50% more if > 59 years old - does not appear to state % if > 70
• Optimize vitamin D from the sun
• All items in category Noontime Sun and vitamin D 331 items
• Items in category Seniors and Vitamin D 431 items
• Intestines need more vitamin D as you age – June 2012
• Vitamin D from psoriasis lamps, tanning beds, and the sun – Jan 2012

See also web

• Sunshine Prescription June 2012