There is a fantastic neighborhood resource in Thousand Oaks (just adjacent to Westlake Village) called the Goebel Adult Community Center. They have classes, community events, dances, etc. for the senior community and people really love it! It's part of the Conejo Valley Parks and Recreation Department 805.495.6471.
Add to this the Civic Arts Center, Gardens of the World, The Lakes, The Westlake Promenade, fine dining and outdoor shopping and it's a great place for anyone!
I'd love to chat more, so please feel free to contact me anytime.