Editor's Review of Mature Free And Single
Mature Free And Single is a dating site for people over 40. My local search returned a pretty good selection of potential dating partners. Although the search features could be better. And based on who was online and how many new members joined that day, the site doesn't appear to have that many members.
Also note that the free in the name doesn't mean the site is actually free. You can register for a free profile however to use majority of the sites features you will need to upgrade to a paid membership.