[Avodah] cohen gadol and marriage to a pubescent girl

[M Cohen]

...in most cases the issue in not applicable, because when appointed the 
KG can stay married to his current wife.

ie only in the relatively rare case of a widowed KG would the mitzvah have
relevance.

in any case, I always understood the mitzvah to be a gzeiras hakasuv
(and certainly there is no question that the din applies today even 
if societal norms have chged)

mordechai cohen