eHarmony has survived since 2000. It may have older users due to its longevity. It's also proficient.
OurTime was designed specifically for people ages 50 and up, making finding singles in your age group a breeze.
Zoosk's interface is intuitive so non-techies can quickly learn its features. "Its personalised you find highly compatible users with your interests and preferences.
SeniorMatch is another site designed for people over 50. In fact, those under 40 aren't allowed to sign up!
SilverSingles only accepts over-50s. it matches mature singles seeking serious relationships. "The site's personality test matches users by values, interests, and lifestyles."