I've gone on a few B-paced and C-paced rides with the Massapequa Park Bike Club. The folks on those rides do tend to be older (30's and up), but I've always had a good time. They got a calendar of upcoming rides at their website for anybody looking to do group rides:
http://www.massparkbikeclub.org
I've also ventured further west and done a few rides with the 5-Borough Bike Club in New York City:
http://www.5bbc.org Also older folks, but always good company.
Both clubs are year-round, so right now is the season of crazies like me who ride all bundled up in our winter gear, LOL.
For me, company is always welcome on a ride-- with the clubs or arrange by PM.