Populations with more than 50 ng of vitamin D
The prevalence of Vitamin D deficiency and effects of ultraviolet light on Vitamin D levels in elderly Turkish population
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Archives of Gerontology and Geriatrics, Volume 40, Issue 1 , Pages 53-60, January 2005
24 senior woman, average age 73. 158 nmols/l ± 108 = 63 ng/ml ±43

It appears that some peoples around the world still get outdoors enough to get lots of vitamin D
See also VitaminDWiki
Traditionally living Africans have 46 ng vitamin D levels – Jan 2012
Chart of Vitamin D levels vs race - April 2013 has the following chart
