Along with several Michael Mouse entries, a Jesus Christ entry for 2001 bc which list parents as 'Joseph' and 'The Virgin Mary', I found the one for Joseph Smith.
I have selected for discussion the ones where the female was under the age of 20 at the point of the marriage.
Sarah Lawrence 17 (Joseph Smith 37)
Nancy Winchester 18 (Joseph Smith 41)
Helen M Kimball 14 (Joseph Smith 37)
Lucy Walker 17 (Joseph Smith 37)
Sarah Whitney 17 (Joseph Smith 36)
Melissa Lott 19 (Joseph Smith 37)
Add to this official information the actual purpose of Polygamy.
...for they are given unto him to multiply and replenish the earth, according to my commandment, and to fulfil the promise which was given by my Father before the foundation of the world, and for their exaltation in the eternal worlds, that they may bear the souls of men; for herein is the work of my Father continued, that he may be glorified. (D&C 132)
Frankly I find the thought of a mid thirties Joseph marrying teenagers for the purpose of procreating with them quite disturbing.
However, was this an accepted custom and practice of the time and the place where Joseph lived - that teenage girls married mid thirties men?