If you're not interested in breeding (or they are not breeding quality) I would have them both spayed and neutered for health reasons. Here's a link that tells about the benefits.
http://dogbreedinfo.com/spayingneutering.htm
Here's another link about deciding whether to breed or not to consider.
http://www.dogbreedinfo.com/breeding.htm
P.S. we have had 'dads' on here younger than 7 months, but AKC does require the male to be at least 7 months to have the puppies registered with AKC.