Spaces are shared interest are superb for fulfilling people as a whole, irrespective of your actual age. As with all people, desires and behavior differ dependent on the person.
Some web sites will have you imagine there are particular kinds of cougar: at her and seeing if she smiles back if you meet a woman at the bar, you might show your interest by smiling. You might then approach her and inquire buying her a glass or two.
As you, your tactic would be different if you are interested in a woman who is in the same running club. Be ready for rejection, and go gracefully.