An article by Arthur O. Tucker, PhD, and Rexford H. Talbert appears in the 100th issue of the peer-reviewed journal, HerbalGram (American Botanical Council ) published in 2013, which identified the manuscript as being of 16th century New World origin.

A link can be found here [1], with the pdf here [2] (checked April 2017). An article on another VM wiki is at [3]. There are various mentions on other websites.

Other analysis indicates that the Voynich Manuscript is of the early 15th century and of Italian origin.