My father in law met his new wife on this site....http://seniorfriendfinder.com/go/g1351697
He says it's awesome!
match.com has the largest senior community of any online dating site. They guarantee you will meet somebody within 6 months. I have no personal experience with any dating site, but ConsumerRankings.com gives match.com the highest ratings for senior dateing sites on the web.
Being in that Senior category myself (according to AARP) I would think that Senior Dating sites would be more productive than the normal dating sites. Most seniors don't have a reason to be playing games and all that. Just watch out for the money grabbers.
i saw a commercial for a site called seniorpeoplemeet.com